JP2006136001A - Mobile phone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the influence of a timing error of a built-in clock and enable accurate determination of a reproduction time limit, and to prevent the illegal use of content information by eliminating the influence of a user's intentional variation of the timekeeping time.
A content information reproduction time limit is determined using a time measured by a system clock 22 managed by a system time of a base station BS, and the content information when the content information is information within the reproduction time limit. When the content information is information outside the reproduction expiration date, a message indicating “expiration date” is generated and the message is displayed on the display unit 15 without performing the reproduction processing of the content information. It is intended to be displayed.
[Selection] Figure 1

Description

  The present invention relates to a mobile phone having a time-reproduction function for content information.

2. Description of the Related Art In recent years, there are an increasing number of information terminal devices such as notebook personal computers and mobile phones that have a function of reproducing content information that is received via a communication network or recorded on a recording medium. If such an apparatus is used, the user can reproduce and enjoy content information including favorite music and video regardless of location, which is very convenient.
JP 2000-47867 A

The object of the present invention is to enable accurate reproduction deadline management by eliminating the influence of the clocking error of the built-in clock without adding new receiving means, and effectively prevent illegal use of content information. An object of the present invention is to provide a mobile phone configured to do so.

In order to achieve the above object, the present invention provides a first that allows a user to arbitrarily adjust the time.
And a second clock that is provided separately from the first clock and cannot be set by the user, and the sync channel signal is switched by switching to the sync channel when the power is turned on, during standby, or during communication. Receiving means capable of receiving and downloading content information; means for taking out standard time data from the sync channel signal and adjusting a time measured by the second clock based on the standard time data; In response to the reproduction request for the content information downloaded by the receiving means, the time count of the adjusted second clock is read out and compared with the reproduction expiration date of the content information, and the adjusted second clock Determining means for determining whether the timed time is within the reproduction validity period of the content information; When the counting time of the second clock is is determined to be within the reproduction time limit of the content information, characterized by comprising a reproduction control means for enabling reproduction of the content information.

Therefore, according to the present invention, it is possible to determine the reproduction time limit of the content information according to the standard time without providing a new receiving means, thereby eliminating the influence of the clocking error of the built-in clock and accurately determining the reproduction time limit. In addition, it is possible to provide a mobile phone capable of preventing unauthorized use of content information by eliminating the influence of intentional timing change by a user.

  Hereinafter, embodiments of the present invention will be described.

In the first embodiment of the present invention, a CDMA mobile communication terminal is provided with a system clock that receives system time data broadcast from a base station and performs a clock operation based on the received data, and reproduces content information. At this time, if a reproduction expiration date is set for the content information, it is determined whether or not the content information can be reproduced by comparing the reproduction expiration date with the time measured by the system clock. Then, when it is determined that reproduction is possible, the content information can be reproduced.

FIG. 1 is a block diagram showing a configuration of a mobile communication terminal which is a first embodiment of an information terminal apparatus according to the present invention. This mobile communication terminal MS employs a CDMA (Code Division Multiple Access) system as a radio access system with a base station BS.

The radio frequency signal transmitted from the base station BS is received by the antenna 1 and then input to the receiving circuit (RX) 3 via the antenna duplexer 2 (DUP). In the reception circuit 3, the radio frequency signal is mixed with the reception local oscillation signal output from the frequency synthesizer (SYN) 4 and converted into an intermediate frequency signal or a baseband signal. The frequency of the reception local oscillation signal generated from the frequency synthesizer 4 is equal to the control signal S from the control unit 12A.
Indicated by YC.

The received intermediate frequency signal or the received baseband signal is input to the CDMA signal processing unit 6. In the CDMA signal processing unit 6, orthogonal demodulation processing and despreading processing using a spreading code assigned to the reception channel are performed on the received reception intermediate frequency signal or reception baseband signal, thereby depending on the data rate. Demodulated data in a predetermined format can be obtained.

The demodulated data is input to the voice code processing unit 7. Control data indicating the data rate among the demodulated data is input to the control unit 12A as a reception data rate.

The voice code processing unit 7 performs a decompression process on the demodulated data output from the CDMA signal processing unit 6 according to the reception data rate notified from the control unit 12A, and then performs a decoding process using Viterbi decoding or the like And error correction decoding processing are performed to reproduce the baseband received digital data.

The PCM code processing unit 8 performs different signal processing according to the type of communication (voice communication, image or data communication) output from the control unit 12A. That is, at the time of voice communication, the reception digital data output from the voice code processing unit 7 is PCM decoded and an analog reception signal is output. The analog reception signal is amplified by the reception amplifier 9 and then output from the speaker 10. At the time of image or data communication, the received digital data output from the voice code processing unit 7 is supplied to the control unit 12A. The control unit 12A stores the received digital data in the storage unit 13 and causes the display unit 15 to display the received digital data.

The received digital data is stored in a portable information terminal (PDA: not shown) as necessary.
It is also possible to transfer to an external information terminal device such as a personal digital assistance) or a notebook personal computer via an external interface (not shown).

On the other hand, the input voice of the speaker at the time of voice communication is input as an analog transmission signal through the microphone 11 and amplified to an appropriate level by the transmission amplifier 18. Then, it is input to the PCM code processing unit 8. The PCM code processing unit 8 performs PC processing on the input analog transmission signal.
M encoding processing is performed. The transmission data generated in this way is supplied to the voice code processing unit 7. Further, data output from the external information terminal device is input to the control unit 12A via an external interface (not shown), and is input from the control unit 12A to the speech code processing unit 7 via the PCM code processing unit 8.

At the time of voice communication, the voice code processing unit 7 detects the energy amount of the input voice from the transmission voice data output from the PCM code processing unit 8, and determines the data rate based on the detection result. Then, the transmission data is compressed into a burst signal having a format corresponding to the data rate, further subjected to error correction coding processing, and then output to the CDMA signal processing unit 6. On the other hand, at the time of image or data communication, the transmission data output from the PCM code processing unit 8 is compressed into a burst signal having a format corresponding to a preset data rate. Then, the compressed transmission data is subjected to error correction coding processing to obtain a CDMA signal processing unit 6.
Output to. Note that the data rate during voice communication and during image or data communication is notified to the control unit 12A as a transmission data rate.

The CDMA signal processing unit 6 performs spreading processing on the burst signal compressed by the voice code processing unit 7 using a spreading code assigned to the transmission channel. The spread-coded transmission signal is subjected to orthogonal modulation processing, and the orthogonal modulation signal is transmitted to a transmission circuit (TX) 5
Output to.

The transmission circuit 5 combines the quadrature modulation signal output from the CDMA signal processing unit 6 with a transmission local oscillation signal generated from the frequency synthesizer 4 and converts it into a radio frequency signal. Then, the transmission circuit 5 amplifies only the effective portion of the radio frequency signal based on the transmission data rate notified by the control unit 12A, and outputs it as a transmission radio frequency signal. The transmission radio frequency signal output from the transmission circuit 5 is supplied to the antenna 1 via the antenna duplexer 2, and is transmitted in bursts from the antenna 1 to a base station (not shown).

The input unit 14 is provided with a key group such as a dial key, a call key, a power key, an end key, a volume adjustment key, and a mode designation key, and the display unit 15 is provided with an LCD display and an LED. The LCD display displays information stored in the telephone directory, outgoing and incoming call history, telephone number of the terminal device of the other speaker, the operating state of the own device, and the like. The LED is lit or blinked when notifying the user of the occurrence of an incoming call or when charging the battery 16 is requested.

Reference numeral 17 denotes a power supply circuit, which generates a predetermined operating power supply voltage Vcc based on the output of the battery 16 and supplies it to each circuit unit. The power supply circuit 17 is also provided with a charging circuit, and the battery 16 is charged by this charging circuit.

By the way, the mobile communication terminal of this embodiment includes a storage unit 13 for storing content information and the like,
A user clock 21 and a system clock 22 are provided. Each of the user clock 21 and the system clock 22 performs a time measuring operation using an RTC (Real Time Clock). However, while the user clock 21 can be arbitrarily set by the user manually, the system clock 22 cannot set the time by the user, and the system clock data received from the base station BS during standby and during communication. Synchronize timing operation.

The control unit 12A includes, for example, a microcomputer as a main control unit. The control unit 12A executes a wireless connection control according to incoming / outgoing calls, enables a voice communication and a data communication, a position registration control function, an idle In addition to the control functions inherent to the portable terminal such as the handoff control function, a content information reproduction control function 12a and an expiration date determination function 12b are provided as new control functions according to the present invention.

When the content information is reproduced, the expiration date determination function 12b determines whether or not a reproduction expiration date is set for the content information. Then, when the reproduction expiration date is set, the time measured by the system clock 22 is compared with the reproduction expiration date to determine whether or not it is within the expiration date.

The content information reproduction control function 12a reads the content information from the storage unit 13 and executes the reproduction control when the measured time of the system clock 22 is determined to be within the expiration date by the expiration date determination function 12b. On the other hand, if it is determined that the time measured by the system clock 22 is out of the expiration date, a message indicating “expired” is generated and displayed on the display unit 15 without performing reproduction control of the content information.

The content information reproduction control function 12a and the expiration date determination function 12b are both realized by causing the microprocessor of the control unit 12 to execute a program. This program is stored in a program memory in the control unit 12 or a program storage area in the storage unit 13. The program storage means in the program memory or the program storage area can be recorded in advance by a program writer at the time of manufacture, or read from an external memory such as a CDROM or a memory card after the operation of the terminal device is started. Some are written in the storage area, and some are downloaded from the site of the communication carrier or manufacturer via the communication network and written in the program memory or the program storage area.

Next, the content information reproduction operation by the mobile communication terminal configured as described above will be described. FIG. 2 is a flowchart showing the procedure and details of content information reproduction control executed by the control unit 12A.

Content information is stored in advance in the storage unit 13. The content information is downloaded from a site on the Internet, for example, or transferred from an external information device such as a personal computer via a wireless interface such as a cable or Bluetooth,
Alternatively, it is read into the terminal by reading from the memory card and stored in the storage unit 13.

The time measured by the system clock 22 becomes indefinite when the battery 16 is removed. This indefinite state is not resolved only by mounting the battery 16, but the system time data broadcast by the base station BS is received by the time acquisition / update control function 12d, and the system time data is received based on the received system time data. The process continues until the time is initialized in the system clock 22. When the timekeeping time is initially set, the system clock 22 starts a self-propelled timekeeping operation based on RTC (Real Time Clock).

When the system clock 22 starts a self-propelled timing operation, the control unit 12A periodically receives the system time data broadcast from the base station BS during the standby period and the communication period, and receives the received system time. The time measured by the system clock 22 is adjusted based on the data. Therefore, the time measured by the system clock 22 is always synchronized with the system time of the base station, and there is no fear that it will be changed by a user operation.

The system time data is received by temporarily switching the reception channel from the paging channel to the sync channel, receiving the sync channel signal transmitted by the base station, and extracting the system time data from the received sync channel signal. Done.

While waiting, the control unit 12A monitors the content reproduction operation by the user in step 2a. In this state, it is assumed that the user designates content information stored in the storage unit 13 and performs a reproduction operation on the input unit 14. Then, the control unit 12A first activates the expiration date determination function 12b, reads the expiration date information corresponding to the specified content information from the storage unit 13 in step 2b, and determines whether the expiration date information is set in step 2c. judge. If the expiration date information is not set, the process proceeds to step 2g unconditionally and the content information reproduction process is executed.

In contrast, it is assumed that expiration date information is set in the specified content information. In this case, the control unit 12A proceeds to step 2d and first takes in the time measured from the system clock 22 here. In step 2e, the time measured by the system clock 22 is compared with the expiration date information previously read from the storage unit 13, and whether or not the specified content information is information within the reproduction expiration date is determined in step 2f. judge.

If the result of this determination is that the designated content information is information within the reproduction expiration date, the control unit 12A activates the content information reproduction control function 12a, and the reproduction processing of the designated content information in step 2g. Execute. For example, the reproduction processing is performed by the storage unit 13
The content information is read out, and it is determined whether the format of the content information is, for example, audio content such as music or video content composed of still images used as wallpaper. If it is an audio content, the audio data is decoded and then output from the speaker 10 via the PCM code processing unit 8 and the receiving amplifier 9. On the other hand, in the case of video content, the still image data is decoded and then displayed on the display unit 15.

If the content information is moving image content composed of audio data and moving image data, the audio data is decoded and then output from the speaker 10 via the PCM code processing unit 8 and the receiving amplifier 9, while moving image data Is decoded and displayed on the display unit 15. The audio data output operation and the moving image data display operation are performed after being synchronized with each other based on a time stamp added to the data.

If a speaker for audio content reproduction is provided in addition to the above-described speaker for reception 10, it is preferable to control so that audio data is output from the speaker for audio content reproduction. In the case where an output terminal for audio data and video data is provided, it is also possible to supply the audio data and video data to an external personal computer or the like via this output terminal for output or display. is there.

Then, when the reproduction of the content information is started, the control unit 12A monitors the end of the reproduction at step 2i, and returns to the standby state when the reproduction is completed.

On the other hand, it is assumed that in the step 2f, the designated content information is information outside the reproduction expiration date. In this case, the control unit 12A does not perform the content information reproduction process, moves to step 2h, generates a message indicating “expired”, and causes the display unit 15 to display the message. Therefore, the user can recognize that the content information designated by this display message has expired.

As described above, in the first embodiment, the reproduction expiration date of the content information is determined using the time measured by the system clock 22 managed by the system time of the base station BS, and is determined to be within the reproduction expiration date. In this case, the content information can be reproduced. Therefore, as compared with the conventional case where the determination is made by using the time measured by the user clock 21, it is possible to accurately determine the reproduction expiration date of the content information by eliminating the influence of the time measurement error, and to measure the time. Even if the time is intentionally changed by the user, the influence can be eliminated and the illegal use of the content information can be surely prevented.

If the content information designated as the reproduction target is information outside the reproduction expiration date, a message indicating “expiration date” is generated without performing the reproduction processing of the content information, and this message is displayed on the display unit 15. Is displayed. Therefore, the user can clearly recognize from the displayed message that the specified content information has expired.

In the second embodiment of the present invention, GPS (Global P) is used as means for acquiring the standard time from the outside.
When reproducing content information using an ositioning system) receiver, system time data is received by the GPS receiver. Then, by comparing the received system time data with the reproduction expiration date of the content information, it is determined whether or not the content information is information within the reproduction expiration date. When it is determined, the content information can be reproduced.

FIG. 3 is a block diagram showing the configuration of the mobile communication terminal according to the second embodiment of the present invention. In the figure, the same parts as those in FIG.

The mobile communication terminal of this embodiment includes a GPS receiver 30. The GPS receiver 30 receives GPS signals broadcast by a plurality of GPS satellites (not shown), extracts system time data from the GPS signals, and supplies the system time data to the control unit 12B.

The control unit 12B has a content information reproduction control function 12 as a control function according to the present invention.
a and an expiration date determination function 12c.

Of these, the expiration date determination function 12c takes in the system time data from the GPS receiver 30 when a playback request for content information for which a playback expiration date is set is input. Then, by comparing the fetched system time data with the reproduction expiration date of the content information, it is determined whether or not the content information is information within the reproduction expiration date.

The content information playback control function 12a enables playback of the content information when the expiration date determination function 12c determines that the content information is information within the playback expiration date. On the other hand, when the content information is information outside the reproduction expiration date, the content information is not reproduced, and a message indicating that “the reproduction expiration date is out of date” is generated and displayed on the display unit 15.

Since it is such a structure, the reproduction | regeneration expiration date of content information is determined each time GPS
This is performed based on the system time data received by the receiver 30. Therefore, as compared with the conventional case where the determination is made by using the time measured by the user clock 21, it is possible to accurately determine the reproduction expiration date of the content information by eliminating the influence of the time measurement error, and to measure the time. Even if the time is intentionally changed by the user, the influence can be eliminated and the illegal use of the content information can be surely prevented.

If the content information designated as the reproduction target is information outside the reproduction expiration date, a message indicating “expiration date” is generated without performing the reproduction processing of the content information, and this message is displayed on the display unit 15. Is displayed. Therefore, the user can clearly recognize from the displayed message that the specified content information has expired.

Furthermore, by using the GPS receiver 30 as the standard time acquisition means, a system other than the CDMA mobile communication system in which the base station does not broadcast system time data, for example, TDM
The present invention can also be implemented in A mobile communication systems and analog mobile communication systems.

In the first embodiment, in addition to the user clock 21, a system clock 22 is provided in which the clocked time is corrected based on the received system time data, and the reproduction of content information is enabled based on the clocked time of the system clock 22. The case of determining the deadline was described.

However, the present invention is not limited to this, and when the content information reproduction request is input, the time measured by the user clock is adjusted based on the received system time data,
It may be configured to determine the reproduction expiration date of the content information based on the adjusted time.

FIG. 4 is a block diagram showing the main configuration of the mobile communication terminal according to this embodiment.
The same parts as those in FIG. The control unit 12C is provided with a time adjustment control function 12e.

The time adjustment control function 12e receives the latest system time data from the base station BS when a reproduction request for content information with a reproduction expiration date is input from the input unit 14, and receives the received system time data. Based on the time data, the clock time of the user clock 21 is adjusted to the correct time.

The expiration date determination function 12d fetches the adjusted correct time count from the time adjustment control function 12e. Then, it is determined whether or not the content information is within the reproduction expiration date by comparing the fetched time measured with the reproduction expiration date of the content information.

The content information playback control function 12a enables the content information to be played back when the expiration date determination function 12d determines that the content information is information within the playback expiration date. On the other hand, when the content information is information outside the reproduction expiration date, the content information is not reproduced, and a message indicating that “the reproduction expiration date is out of date” is generated and displayed on the display unit 15.

With such a configuration, since the reproduction expiration date is determined based on the time measured by the user clock 21 adjusted based on the system time data, it is possible to always perform an accurate determination.
In addition, the system clock 22 can be made unnecessary by using the time measured by the user clock 21, and the configuration can be simplified accordingly. This embodiment is suitable for terminals other than CDMA mobile communication terminals that do not have a system clock as standard equipment.

On the other hand, with the configuration shown in FIG. 4, the time measured by the user clock 21 is automatically adjusted to the system time every time the content information is reproduced. For this reason, for example, when the user variably sets the clock time of the user clock 21 to an arbitrary time, such as advancing the clock time of the user clock 21, the user must reset the clock time of the user clock 21 each time.

Therefore, a time correction processing function is provided, and when a reproduction request for content information is input, the time measured output from the user clock 21 is corrected based on the received system time data,
Based on the corrected time, the content information reproduction expiration date is determined.

FIG. 5 is a block diagram showing the main configuration of the mobile communication terminal according to this embodiment.
The same parts as those in FIG. The mobile communication terminal of this embodiment includes a content information reproduction control function 12a, an expiration date determination function 12f, and a time correction processing function 12 in the control unit 12D.
g.

Of these, the time correction processing function 12g corrects the time measured from the user clock 21 based on the received system time data.

The expiration date determination function 12f takes in the time measured by the time correction processing function 12g when a content information reproduction request is input. Then, it is determined whether or not the content information is within the reproduction expiration date by comparing the fetched time measured with the reproduction expiration date of the content information.

The content information playback control function 12a enables the content information to be played back when the expiration date determination function 12d determines that the content information is information within the playback expiration date. On the other hand, when the content information is information outside the reproduction expiration date, the content information is not reproduced, and a message indicating that “the reproduction expiration date is out of date” is generated and displayed on the display unit 15.

With such a configuration, the user clock 21 is included in the content information expiration date determination process.
The time obtained by correcting the time measured from the system time data is used. Therefore, the reproduction expiration date can always be determined based on the accurate time corrected based on the system time data, thereby enabling accurate determination. Further, the dedicated system clock 22 can be eliminated.

Moreover, since the time measured by the user clock 21 itself is not adjusted, the user can select the user clock 2
Even when the time count of 1 is advanced by a certain time, for example, the user does not need to reset the time count of the user clock 21 each time, the operability is improved.

Furthermore, the present invention can be implemented with various modifications as follows. That is,
In the second embodiment, the GPS receiver 30 is used as the standard time acquisition means. However, a standard time receiver may be provided instead, and standard time information broadcast by a standard time transmitting station installed in Mount Otakado, Fukushima Prefecture may be received and used.

In each of the above embodiments, a message indicating “expiration expired” is generated and displayed when it is determined that the reproduction expiration date is out of date. May be generated and displayed. In this case, it is better to display the remaining days or time of the expiration date together.

In addition, as a notification means for the message that cannot be reproduced, in addition to displaying the text message on the display unit 15, a voice message may be generated by the voice synthesis function and the voice message may be output from the speaker 10.

In each of the above-described embodiments, the content information in which the reproduction expiration date is set has been described as an example.
The present invention can be similarly applied to content information for which a reproduction valid period is set. In this case, the time limit of the user clock adjusted or corrected by the system time data, or the clock time of the system clock is used as the start time of use, and the playback expiration date is set based on the clock time and the playback valid period. To do. That is, the reproduction effective period is converted into the reproduction effective period, and thereafter, it is determined whether the converted effective period is within the effective period using the converted reproduction effective period.

Further, in each of the above embodiments, a CDMA mobile communication terminal has been described as an example of an information terminal device. However, a mobile communication terminal employing another radio access method such as a TDMA mobile communication terminal or an analog mobile communication terminal may be used. In addition to a mobile communication terminal, a portable electronic device such as a notebook type personal computer or audio player, a video playback device, a game machine, or a watch, or a fixed installation type personal computer or audio player may be used.

In addition, the configuration of the expiration date determination function and the content information reproduction control function, the control procedure and control content, the type and form of the content information, the configuration thereof, and the like are variously modified without departing from the gist of the present invention. it can.

The block diagram which shows the structure of the mobile communication terminal which is the 1st Example of the information terminal device concerning this invention. The flowchart which shows the procedure and content of content information reproduction | regeneration control which the control part of the mobile communication terminal shown in FIG. 1 performs. The block diagram which shows the structure of the mobile communication terminal which is the 2nd Example of the information terminal device concerning this invention. The block diagram which shows the principal part structure of the mobile communication terminal which is the other Example of the information terminal device concerning this invention. The block diagram which shows the principal part structure of the mobile communication terminal which is another Example of the information terminal device concerning this invention.

Explanation of symbols

BS Base station MS Mobile communication terminal 1 Antenna 2 Antenna duplexer (DUP)
3 Receiver circuit (RX)
4 Frequency synthesizer (SYN)
5 Transmitter circuit (TX)
6 CDMA signal processing unit 7 voice code processing unit 8 PCM code processing unit 9 receiver amplifier 10 speaker 11 microphone 12 control unit 12a content information reproduction control function 12b, 12c, 12d, 12f expiration date determination function 12e time adjustment control function 12g time correction Processing Function 13 Storage Unit 14 Input Unit 15 Display Unit 16 Battery 17 Power Supply Circuit 18 Transmitting Amplifier 21 User Clock 22 System Clock 30 GPS Receiver

Claims (3)

A first clock that allows the user to arbitrarily adjust the time;
A second watch that is provided separately from the first watch and cannot be set by the user;
Receiving means capable of receiving a sync channel signal by switching to a sync channel during power-on, standby or communication, and downloading content information;
Means for extracting standard time data from the sync channel signal and adjusting the time measured by the second clock based on the standard time data;
In response to the reproduction request for the content information downloaded by the receiving means, the time measurement time of the adjusted second clock is read out and compared with the reproduction expiration date of the content information, and the time adjustment of the adjusted second clock is performed. Determining means for determining whether the time is within the reproduction validity period of the content information;
And a playback control unit that enables playback of the content information when the determined time of the adjusted second clock is determined to be within the playback expiration date of the content information. A mobile phone characterized by. A first clock that allows the user to arbitrarily adjust the time;
A second timepiece that is provided separately from the first timepiece and cannot be set by the user and operates based on the RTC;
Receiving means capable of receiving a sync channel signal by switching to a sync channel during power-on, standby or communication, and downloading content information;
Means for extracting standard time data from the sync channel signal and adjusting the time measured by the second clock based on the standard time data;
In response to the reproduction request for the content information downloaded by the receiving means, the time measurement time of the adjusted second clock is read out and compared with the reproduction expiration date of the content information, and the time adjustment of the adjusted second clock is performed. Determining means for determining whether the time is within the reproduction validity period of the content information;
And a playback control unit that enables playback of the content information when the determined time of the adjusted second clock is determined to be within the playback expiration date of the content information. A mobile phone characterized by. Battery,
A first clock that allows the user to arbitrarily adjust the time;
Provided separately from the first clock, the time cannot be set by the user, and when the battery is removed, the state is undefined, and the undefined state receives a sync channel signal and obtains standard time data. A second clock that is maintained until the time is initialized,
Receiving means capable of receiving a sync channel signal by switching to a sync channel during power-on, standby or communication, and downloading content information;
Means for extracting standard time data from the sync channel signal and adjusting the time measured by the second clock based on the standard time data;
In response to the reproduction request for the content information downloaded by the receiving means, the time measurement time of the adjusted second clock is read out and compared with the reproduction expiration date of the content information, and the time adjustment of the adjusted second clock is performed. Determining means for determining whether the time is within the reproduction validity period of the content information;
And a playback control unit that enables playback of the content information when the determined time of the adjusted second clock is determined to be within the playback expiration date of the content information. A mobile phone characterized by.

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