JP2003189366A - Communication system with apparatus for preventing illegal use of information and method for preventing illegal use of information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system with an information illegal use preventing apparatus and an information illegal use preventing method that can enhance the security so as not to be illegally used even by a conventional terminal and can be effective even with provision of an accounting processing function. <P>SOLUTION: With respect to a terminal 2 used for processing card accounting of a purchased article, an entry terminal 1 for entering card scan and a password entered by a customer is provided separately from the accounting processing terminal 2, an accounting center 4 discriminates a state of interrupted wireless communication between the entry terminal 1 and the accounting processing terminal 2 and disables illegal use of customer information such as card information and the password entered by the entry terminal 1 by deleting the customer information or the like in a prescribed time after alerting a user by an alarm. Further, the center 4 allows the user to enter a password within a prescribed time as a remedy when the user of the entry terminal 1 goes outside of the communication zone in mistake. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system with a device for preventing unauthorized use of information and a method for preventing unauthorized use of information.

[0002]

2. Description of the Related Art Conventionally, mobile portable terminals have been used for settlement of product transactions with customers and product management. This is a terminal that has excellent portability and has functions corresponding to various payment methods that occur in product management and product transactions. There are various functions depending on the application, but for example, from the basic functions required for payment such as entering product information and product price, calculating the total amount of purchased products, issuing receipts, credit cards and debits by customers. Some even have functions that support payment with cards. In the card payment method using a credit card or debit card, the operator of this terminal receives the card from the customer and causes the terminal to read the information of the magnetic part or IC part of the card. The customer is asked to enter the personal identification number. Therefore, important information such as the customer's bank account and personal identification number is stored in this terminal, so use a private program so that no one can easily disclose this information. I am making it.

However, in the conventional mobile handheld terminals, since a program is created for each operator, the number of development man-hours is enormous, and customization also has to be done for each terminal, which costs too much. It was producing results.

Therefore, recently, a handheld terminal (HHT), which is a general-purpose terminal constructed by an open architecture technology such as Windows CE (registered trademark), has come on the market. This opens a function to read product information using a keypad or a scanner, a function to calculate target information from input information, a display function to display input information and calculation results, an output function to output display contents, etc. It is a general-purpose terminal realized based on the architecture technology. This terminal is used in various fields because the software used is also used for general purposes.

[0005]

SUMMARY OF THE INVENTION Such an HHT is
Since it is excellent in versatility, it also has a drawback that information is easily disclosed to the above-mentioned advantages, and it has been limited to mere use of product management or the like that does not have a settlement transaction function.

The present invention aims to strengthen security so as not to be misused even in a general-purpose terminal, and is effective even if it has a settlement processing function, and a communication system with an unauthorized use prevention device of information. The purpose is to provide a method for preventing unauthorized use of information.

[0007]

The present invention is configured as follows to solve the above problems. That is, according to one aspect of the present invention, in a wireless communication system including a communication device that performs wireless communication and a slave device that performs wireless communication with the master device using the communication device as a master device, information is input to the slave device. Information input means, information recording means for recording information in the slave unit, communication state detecting means for detecting a communication state between the master unit and the slave unit, and the recorded information according to the communication state And an information use preventing means for preventing use of a part or all of the above.

With this configuration, it is possible to prevent the information recorded in the slave unit from being illegally used with the communication state between the master unit and the slave unit as a criterion. Further, according to one aspect of the present invention, a wireless communication including a communication device that performs wireless communication and a slave device that performs the wireless communication with the master device as the master device and performs a part or all of the payment processing. In the system, information input means for inputting information necessary for settlement, information recording means for recording the input information, communication state detecting means for detecting a communication state between the master unit and the slave unit, The slave unit is provided with an information use preventing unit that prevents use of part or all of the recorded information when the detected communication state is the disconnection state.

With this configuration, a part or all of the settlement process can be performed by the slave unit, and the slave unit is determined to be in a state in which the slave unit cannot communicate with the master unit. Prevent unauthorized use of recorded information.

Further, according to one aspect of the present invention, a communication device for performing card payment processing of purchased goods and transmitting / receiving information relating to the card payment processing via communication with a payment center, and the communication device. In a payment processing system consisting of a master unit and a slave unit that performs a part of the processing of the card payment by wireless communication with the master unit, a communication state detecting unit that detects a communication state between the master unit and the slave unit, And a warning generation unit for issuing a warning to the user of the slave unit when the detected communication state is the disconnection state.

With this configuration, the slave unit, which performs a part of the settlement process, issues a warning to the user of the slave unit based on the condition that communication with the master unit cannot be communicated, and the slave unit It is possible to prevent the use of machines.

According to an aspect of the present invention, a communication device for performing card payment processing for purchased goods and transmitting / receiving information relating to the card payment processing via a communication to a payment center, and the communication device. In a payment processing system comprising a master unit and a slave unit that performs a part of the card settlement process by wireless communication with the parent unit, information input means for inputting customer information necessary for the card settlement, and the input unit. Information recording means for recording customer information, communication state detecting means for detecting a communication state between the master unit and the slave unit, and of the recorded customer information when the detected communication state is a disconnection state. An information use preventing unit that prevents use is provided in the slave.

With this configuration, it is possible to prevent the use of the recorded customer information from the slave unit that performs a part of the settlement process, based on the condition that communication with the master unit is no longer possible. You can

Further, according to one aspect of the present invention, a communication device for performing card payment processing for purchased goods and transmitting / receiving information relating to the card payment processing via a communication to a payment center, and the communication device. In a payment processing system comprising a master unit and a slave unit that performs a part of the card settlement process by wireless communication with the parent unit, information input means for inputting customer information necessary for the card settlement, and the input unit. Information recording means for recording customer information, communication state detecting means for detecting a communication state between the master unit and the slave unit, and a user of the slave unit when the detected communication state is a disconnected state. Warning generating means for issuing a warning, information usage preventing means for preventing the use of the recorded customer information after a predetermined time has elapsed after issuing the warning, and a predetermined alarm within the predetermined time after issuing the warning. A warning release means for preventing prevents the use of the recorded customer information released the warning generated after the predetermined time based on the password for canceling the constructed to have the handset.

With this configuration, the slave unit that performs a part of the settlement process issues a warning to the user of the slave unit based on the condition that communication with the master unit cannot be communicated, and the use If the person is a predetermined person such as the owner of the child device, the warning is canceled, and if the user is other than the predetermined person, the recorded customer information cannot be used.

Further, the slave unit further has power-on means for turning on the power, and the communication state detecting means is configured to be performed when the power is turned on.
A warning is given to the user of the child device when communication with the parent device is not possible when the power is turned on, and the warning can be canceled if the user is a predetermined person. If the user is other than the predetermined person, the recorded customer information cannot be used.

Further, according to one aspect of the present invention, wireless communication is performed with a master unit that performs card payment processing for purchased products and transmits / receives information relating to the card payment processing via communication to a payment center. A method for preventing unauthorized use of customer information, which is recorded in a slave device that performs a part of the processing of the card payment and is necessary for the part of the processing of the card payment, And detecting the communication state between the slaves,
A warning is issued to the user of the cordless handset when the detected communication state is a disconnection state, the warning is canceled within a predetermined time within the predetermined time after the warning is issued, and within the predetermined time. When it cannot be canceled by the predetermined method, the recorded customer information necessary for processing part of the card payment is made unavailable.

By doing so, the slave unit which performs a part of the settlement process issues a warning to the user of the slave unit based on the condition that communication with the master unit is no longer possible, and the user of the slave unit is notified. Is a predetermined person, the warning is canceled, and if the user is other than the predetermined person, the recorded customer information cannot be used.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, as shown in the system configuration diagram in FIG. 1, various settlement centers 4 that create settlement information related to settlement processing, manage products, and perform processing such as withdrawing cash from a bank account.
Using the HHT 2 that transmits payment information via the communication network 3 as the main body, and inputting customer information such as a password and card information necessary to create the payment information from the input keypad 1 provided separately from the main body 2. In this example, the information can be transmitted to HHT2. In this case, HHT2
Is carried by the operator to perform various input operations such as payment information, but when the customer wants the input processing, the input keypad 1 is handed over, so that the input keypad 1 side is prevented from unauthorized use due to theft or the like. To have an unauthorized use prevention function.

2 and 3 are block diagrams of the input keypad 1 and the HHT 2 described above, respectively.
In the block diagram of the input keypad 1 shown in FIG.
Reference numeral 01 is a power supply unit for supplying electric power to the electric circuit of the input keypad 1 by a rechargeable battery or the like, 202 is a magnetic card reader unit for reading information recorded on the magnetic card, for example, by sliding the magnetic card, 203 Is an IC card reader / writer unit for recording information on the IC card by reading the information on the IC card by, for example, contacting the IC card, and 204 for turning on / off the power supply, inputting a password, and confirming or correcting the input information. Etc. is an operation unit including a minimum number of input buttons necessary for the customer's operation, 205 is a display unit for displaying the entered password, transaction amount, etc., 206 is a warning used for theft prevention, etc. Is a notification unit that notifies the input person of the input keypad 1 of a buzzer, a light emission, a text message, etc.
Is a control unit that is composed of a central processing unit (CPU), memory, flash ROM disk, etc., and executes data storage, recording, and arithmetic processing, and 208 is a known wireless communication between digital devices. It is a communication unit that transmits and receives information to and from the HHT 2 using Bluetooth that enables communication or IrDa that enables communication using infrared rays.

In the block diagram of the HHT 2 shown in FIG. 3, reference numeral 301 is a power supply unit for supplying electric power to the electric circuit of the HHT 2 by a rechargeable battery, and 302 is confirmation and correction of product information and input information, and the settlement center 4 and the HHT2. An operation unit including an input button for instructing transmission of information to the device, a display unit 303 for displaying product information, transaction amount, etc., and a reference numeral 304 for a central processing unit (CPU), a memory, a flash ROM. It is a control unit that is configured by a disk or the like and executes data storage, recording, and arithmetic processing.
Reference numeral 05 is a printing unit for printing transaction results, such as a printer, and 306 is an input keypad such as Bluetooth which enables wireless communication between digital devices and IrDa which enables infrared communication. 1 is a communication unit that transmits and receives information to and from 1, and 307 is a center communication unit that communicates with the settlement center 4 using, for example, packet communication.

Here, the flow of settlement using the HHT 2 and the input keypad 1 will be described with reference to the example of FIG. Figure 4
(A) shows an example of a payment flow when payment is made using a debit card. The operator described below shall operate the HHT2 unless otherwise specified.

First, the operator executes the processing of the settlement operation from the operation unit 302 of the HHT 2 (S401). Next, the operator selects payment by debit card (S402). Furthermore, the operator selects any of the processing of sales, cancellation / return, and balance confirmation. When the sales process is selected (S403), the operator deposits the debit card from the customer, and the magnetic card reader unit 202 of the input keypad 1
Then, the debit card is scanned (S404). When the operator confirms that the information of the debit card has been received on the display unit 303 of the HHT 2, the operator inputs the product code purchased by the customer (S405), and further inputs the amount (S406). Here, the customer is asked to input the personal identification number of the debit card from the input keypad 1 (S40).
7). When the operator confirms that the personal identification number is received on the display unit 303 of the HHT 2, the operator confirms the created payment information (S40).
8). The confirmed payment information is sent to the payment center 4 via the center communication unit 307 of the HHT 2 (S409),
When the transaction is established, an account withdrawal confirmation is issued from the printing unit 305 attached to the HHT 2 (S410), and the transaction ends (S411). FIG. 4B shows an example of a payment flow when payment is made using a credit card. The operator described below shall operate the HHT2 unless otherwise specified.

First, the operator executes the processing of the settlement business from the operation unit 302 of the HHT 2 (S421). Next, the operator selects payment by credit card (S422). Furthermore, the operator selects any one of sales, cancellation / return, and pre-approval processing. When the sales process is selected (S423), the operator deposits the credit card from the customer, and the magnetic card reader unit 20 of the input keypad 1
The credit card is scanned at 2 (S424). When the operator confirms that the information of the credit card is received on the display unit 303 of the HHT 2, the operator inputs the product code that the customer purchases (S425), then inputs the amount of money (S426), and further tax. Input (S427). Here, the payment method such as batch, bonus, division, combined bonus, and revolving is directly confirmed with the customer, and the payment method for which there is a reply is selected from the operation unit 302 of the HHT 2 (S4).
28). Then, the content of the payment information created is confirmed (S4).
29). The confirmed payment information is sent to the payment center 4 via the center communication unit 307 of the HHT 2 (S43).
0) When the transaction is completed, the sales slip is issued from the printing unit 305 attached to the HHT 2 (S431), and the transaction is ended (S432).

The operation of each control unit of the HHT 2 and the input keypad 1 in the settlement flow will be described below with reference to FIGS. 5 and 6. FIG. 5 shows the control unit 304 of the HHT2.
3 is an example of a flowchart showing the operation of FIG.

While power is being supplied from the power supply unit 301 to each electric circuit, the operation unit 302 waits until a payment is selected (S501). When payment is selected,
A debit card or credit card selection message is displayed on the display unit 303 (S502), and the operation unit 302 waits until the debit card or credit card is selected (S503). When the debit card is selected (S504), the sales process is started, a debit card scan request message is displayed on the display unit 303, and the communication unit 208 of the input keypad 1 scans the debit card on the display unit 303. Request (S
505), and waits for the encrypted debit card information scanned by the input keypad 1 to be received via the communication unit 306 (S506). When the debit card information is received, a product code input message is displayed on the display unit 303 (S507), and the product code is waited for input from the operation unit 302 (S508). When the product code is input, an input message for the product price is displayed on the display unit 303 (S509), and the input of the product price is awaited from the operation unit 302 (S510). When the product amount is input, a request message for inputting the personal identification number of the debit card is displayed on the display unit 303, and the communication unit 208 of the input keypad 1 is requested to input the personal identification number via the communication unit 306 ( S511), and waits for the encrypted personal identification number input by the input keypad 1 to be received via the communication unit 306 (S512). Upon receiving the personal identification number, it is confirmed that the personal identification number matches the personal identification number registered in the memory in advance, and a settlement information creation completion message is displayed on the display unit 303 (S513), and the main processing is performed from the operation unit 302. It waits until the content of is confirmed (S514). When this processing is confirmed, necessary information is transmitted to the settlement and payment center 4 of the debit card via the center communication unit 307 (S51).
5). When the transmission of the necessary information is completed (S516), the printing unit 305 prints a receipt (S517), and this processing ends. When a credit card is selected in step S504, sales processing starts, a credit card scan request message is displayed on the display unit 303, and the credit card is displayed on the communication unit 208 of the input keypad 1 via the communication unit 306. (S518), and waits for the encrypted credit card information scanned by the input keypad 1 to be received via the communication unit 306 (S519). When the credit card information is received, a message for entering the product code is displayed on the display unit 3
03 (S520), and the product code is displayed on the operation unit 302.
Waits for input from (S521). When the product code is entered, a message for entering the product amount is displayed on the display unit 303.
(S522), and waits for the product price to be input from the operation unit 302 (S523). When the product amount is entered, a tax input message is displayed on the display unit 303 (S5
24), wait for the tax to be input from the operation unit 302 (S
525). When the tax is input, a payment method selection message is displayed on the display unit 303 (S526), and the selection method is awaited from the operation unit 302 (S527). When the payment method is selected, a payment information creation completion message is displayed on the display unit 303 (S528), and the operation unit 302 waits until the content of this process is confirmed (S529). When this process is finalized, necessary information is transmitted to the payment settlement center 4 of the credit card via the center communication unit 307 (S530). When the necessary information is sent (S
531) and the receipt is printed by the printing unit 305 (S53).
2) Then, this process ends.

FIG. 6 is an example of a flowchart showing the operation of the control unit 207 of the input keypad 1. In this example,
It is assumed that the electric power is supplied from the power supply unit 201 to each electric circuit, the HHT 2 is communicable, and the settlement process is executed.

First, a settlement processing message is displayed on the display unit (S601). Then, it waits for an instruction from the HHT 2 received via the communication unit 208 (S602). When the instruction is received, it is determined whether the content is a content for requesting a debit card scan (S603). If the content is a debit card scan request, a debit card scan message is displayed on the display unit 205 (S60).
4). Then, it is judged whether or not the scan of the debit card is executed (S605), and when the scan is not executed within the predetermined time (S606), the power is turned off.
F to finish. If it is determined in step S605 that the scan has been executed, a standby message is displayed on the display unit 205 (S607). The debit card information input by scanning is stored in the memory of the control unit 207, encrypted, and sent from the communication unit 208 to the communication unit 306 of the HHT 2 (S608). When the transmission of the encrypted debit card information is completed (S609), the communication unit 20
The user waits for an instruction to input a personal identification number from the HHT 2 via S8 (S610). Upon receiving the request for inputting the personal identification number, a personal identification number message is displayed on the display unit 205 (S6).
11), waiting for the input of the personal identification number from the operation unit 204 (S
612). At this time, if the personal identification number is not input from the operation unit 205 within the predetermined time, the power is turned off (S6).
13). When the input of the personal identification number is confirmed in step S612, the personal identification number data is stored in the memory of the control unit 207, encrypted, and sent from the communication unit 208 to the communication unit 306 of the HHT2 (S614). When it is determined that the transmission of the encrypted personal identification number data is completed (S61
5) Turn off the power to finish. Also, step S6
If the request is for a credit card scan in 03, a credit card scan message is displayed on the display unit 2.
05 is displayed (S616). Then, it is judged whether or not the credit card scan is executed from the magnetic card reader unit 202 (S617), and when the scan is not executed within the predetermined time (S618), the power is turned off.
FF and end. If it is determined in step S617 that the scan has been executed, a standby message is displayed on the display unit 205 (S619). Then, the credit card information input by scanning is stored in the memory of the control unit 207, encrypted, and sent from the communication unit 208 to the communication unit 306 of the HHT 2 (S620). When the transmission of the encrypted credit card information is completed (S621), the power is turned off and the process ends.

FIG. 7 is an example of a processing flow for preventing unauthorized use of important data such as a customer's card information and password. In this embodiment, the control unit 2 of the input keypad 1 is used.
It is assumed that this processing is executed at 07.

When the power of the input keypad 1 is turned on (S70
1) First, the initial processing of the input keypad 1 is performed (S702). Then, polling is performed to determine whether communication with HHT2 is possible (S703). As a result, if HHT2 can be detected (S704), the settlement processing execution instruction from the operation unit 204 is waited for (S705), and when the execution instruction is received within a predetermined time, the settlement processing as shown in FIG. 6 is executed (S706). ). If there is no execution instruction within the predetermined time, the power is turned off (S707). Step 70
In the case where HHT2 cannot be detected in 4,
A warning message is displayed on the display unit, a voice output unit (not shown) is provided in the input keypad 1 to sound a warning buzzer, or a light emitting unit (not shown) is provided in the input keypad 1 to emit light to give a warning. Prompt (S708). In this state, the control unit 2 is previously operated from the operation unit 204 within a predetermined time.
When the password registered in the memory 07 is input (S709), the warning is canceled (S710), and the HHT
A message indicating a communication error with 2 is displayed on the display unit 205, and the power is turned off (S711). Step S709
If the password is not entered within the predetermined time with (S7
12) For example, the execution program and the data stored in the memory are erased, and the power is turned off (S713). Methods of erasing the data stored in the memory include a method of forcibly turning off the power of the memory.

Next, an example of an external view of a package used for the HHT 2 and the input device 1 having the above-described configuration will be shown. Figure 8
Is an example of the outer shape of the HHT 2 projected from four directions. 800 is the figure which showed the front of HHT2, ie, the operation side. Reference numeral 810 denotes the back surface of HHT2, and 820
Indicates a lower surface, and 830 indicates a side surface. HHT
2, a front view 800, a display screen 801, such as a liquid crystal display, operation keys 802 having various keys for payment processing, and a printer 803 for issuing a receipt are arranged on the upper side, and a side view 804. As described above, a center communication antenna 804 that communicates with various settlement centers 4 that performs settlement processing, and a communication unit 805 that communicates with the input keypad 1 are arranged.

FIG. 9 shows an example of the outer shape of the input keypad 1 projected from four directions. Reference numeral 900 is a view showing the front surface of the input keypad 1, that is, the operation side. 910
Shows the upper part, 920 shows the side face, and 930 shows the back face. On the outer shape of the input keypad 1, a key 9 that can be used for password input as shown in the front view 900.
01 and a password confirmation screen 902 are arranged. Further, as shown in the top view 910 and the side view 920, a reading portion 903 of the magnetic card and an insertion opening 904 for reading and writing of the IC card are arranged.

As described above, according to the present embodiment, by dividing the payment processing into two, it is possible to hand over the small and lightweight input keypad 1 to the customer who receives the card scan or the password input. Therefore, it is possible to dramatically reduce the burden of weight on the customer. In addition, even if the input keypad 1 is small and lightweight, is easy to be stolen, and is general-purpose and it is easy to illegally use the information, the data cannot be used again without the password outside the communication range with the HHT 2, so the important information of the customer Can be prevented from being illegally used.

The above-described embodiment of the present invention shows one of preferred examples, and for example, prevents unauthorized use of important data such as the customer's card information and password described with reference to FIG. In the processing flow for
It may be configured to only warn the user with a buzzer sound or the like, or the data stored in the memory may be deleted directly without the warning. May be used merely as a reference point of the communication range, and the present invention is not limited to this embodiment.

[0035]

As described above, according to the present invention, even a program having versatility can be prevented from being illegally used because the security is strengthened. It becomes possible, and is particularly effective in the settlement processing. Further, by dividing the payment processing into two, a small and lightweight terminal can be handed over to the customer who inputs the customer information, so that the burden on the customer is dramatically reduced.

[Brief description of drawings]

FIG. 1 is a system configuration diagram in an embodiment of the invention.

FIG. 2 is a block diagram of an input keypad 1 according to the embodiment of the invention.

FIG. 3 is a block diagram of the HHT 2 in the embodiment of the invention.

FIG. 4 is a flow of settlement using the HHT 2 and the input keypad 1 in the embodiment of the invention.

FIG. 5 is an operation flow of the control unit of the HHT 2 in the embodiment of the invention.

FIG. 6 is an operation flow of a control unit of the input keypad 1 according to the embodiment of the invention.

FIG. 7 is a flowchart of a process for preventing unauthorized use of data according to the embodiment of the invention.

FIG. 8 is an external view of the HHT 2 according to the embodiment of the invention.

FIG. 9 is an external view of the input keypad 1 according to the embodiment of the invention.

[Explanation of symbols]

1 Input keypad 2 HHT 3 communication network 4 settlement center

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Junichiro Ohba             1776 Yanoguchi, Inagi City, Tokyo             Within the corporation F-term (reference) 3E042 BA18 CA01 CC02 CC05 CE01                       CE06 EA01                 5B017 AA07 BA08 CA14                 5B035 AA13 BB02 BB09 BC00 CA23                 5K067 AA32 AA42 DD57 EE02 EE10                       EE16 EE23 FF04 FF17 FF20                       FF23 FF27 HH23 HH24 HH36

Claims (7)

[Claims] 1. A wireless communication system comprising a communication device for performing wireless communication and a slave device for performing wireless communication with the master device by using the communication device as a master device, and information input means for inputting information to the slave device. An information recording unit that records information in the slave unit, a communication state detecting unit that detects a communication state between the master unit and the slave unit, and part or all of the recorded information according to the communication state A wireless communication system with a device for preventing unauthorized use of information, comprising: 2. A wireless communication system comprising a communication device for performing wireless communication and a slave device for performing a part or all of a payment process by performing wireless communication with the master device by using the communication device as a master device, which is required for payment. Information input means for inputting various information, information recording means for recording the input information, communication state detection means for detecting a communication state between the master unit and the slave unit, and the detected communication state is A wireless communication system with an unauthorized use prevention device of information, comprising: an information use preventing means for preventing use of a part or all of the recorded information in a disconnected state; 3. A communication device which processes card payment of purchased goods and transmits / receives information related to the processing of the card payment via a communication to a payment center, and wireless communication with the master device using the communication device as a master device. In a payment processing system including a child device that performs a part of the processing of the card payment, a communication state detecting unit that detects a communication state between the parent device and the child device, and the detected communication state is disconnected. And a warning generating means for issuing a warning to the user of the child device, the settlement processing system with a device for preventing unauthorized use of information. 4. A communication device which processes card payment of purchased goods and transmits / receives information relating to the processing of the card payment via a communication to a payment center, and wireless communication with the master device using the communication device as a master device. In a payment processing system including a child device that performs a part of the card payment, an information input unit for inputting customer information necessary for the card payment, and an information recording unit for recording the input customer information. A communication state detecting unit that detects a communication state between the master unit and the slave unit; and an information use preventing unit that prevents use of the recorded customer information when the detected communication state is a disconnected state. A payment processing system with a device for preventing unauthorized use of information, comprising: 5. A communication device which processes card payment of purchased products and transmits and receives information related to the card payment process to and from a payment center, and wireless communication with the master device using the communication device as a master device. In a payment processing system including a child device that performs a part of the card payment, an information input unit for inputting customer information necessary for the card payment, and an information recording unit for recording the input customer information. A communication state detection unit that detects a communication state between the master unit and the slave unit; and a warning generation unit that issues a warning to a user of the slave unit when the detected communication state is a disconnected state, Information use preventing means for preventing the use of the recorded customer information after a predetermined time has elapsed after issuing the warning, and for canceling the warning based on the release password within the predetermined time after issuing the warning. The recorded customer information use illegal use preventing system with payment processing system of information, characterized in that it comprises a warning releasing means, to said slave unit to prevent to prevent the occurring time after. 6. The slave unit according to claim 5, further comprising power-on means for turning on the power, and the communication state detecting means is performed when the power is turned on. A payment processing system with a device for preventing unauthorized use of information. 7. A part of the card payment through wireless communication with a base unit that processes the card payment of the purchased product and transmits / receives information related to the card payment processing via communication to a payment center. A method for preventing unauthorized use of customer information necessary for a part of the processing of the card payment recorded in the slave unit which performs the process of: Detecting, issuing a warning to the user of the cordless handset when the detected communication state is a disconnection state, releasing the warning by a predetermined method within the predetermined time after issuing the warning, the predetermined A method for preventing unauthorized use of information, characterized in that if the information cannot be canceled by the predetermined method within a time period, the customer information necessary for processing a part of the recorded card payment can not be used.