JP2004294519A - Communication device, communication method, and program - Google Patents

Abstract

An object of the present invention is to provide a communication technique capable of performing an ensemble efficiently and easily between a plurality of terminals.
A number designating means for designating the number of persons to communicate with each other, and instructing to directly connect two terminals to perform communication when two persons are designated; There is provided a communication apparatus having connection instruction means for instructing three or more terminals to communicate with each other via a server.
[Selection] Fig. 6

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a communication technology, and particularly to a technology for performing communication between a plurality of terminals.
[0002]
[Prior art]
With the development of communication infrastructure, videoconferencing, live broadcasting, and the like have become active. As a result, it is possible to communicate not only with voice but also with video, even in a remote place.
[0003]
In an electronic musical instrument, transmission and reception of performance data may enable communication by ensemble between remote locations. If this includes video and audio communication, it is expected that the communication will be more enjoyable.
[0004]
In addition, the following patent publications 1 to 4 are disclosed.
[0005]
[Patent Document 1]
JP-A-2-204794
[Patent Document 2]
JP-A-6-35456
[Patent Document 3]
Japanese Patent No. 3271572
[Patent Document 4]
Japanese Patent No. 3277875
[0006]
[Problems to be solved by the invention]
However, a method for efficiently and easily performing communication including performance data, audio data, and video data has not been devised yet.
An object of the present invention is to provide a communication technique capable of performing an ensemble efficiently and easily between a plurality of terminals.
[0007]
[Means for Solving the Problems]
According to one aspect of the present invention, a number specifying means for specifying the number of persons to communicate with each other, and when two persons are specified, an instruction to directly connect two terminals to perform communication, Is provided, there is provided a communication device having connection instructing means for instructing connection of three or more terminals via a server to perform communication.
According to another aspect of the present invention, a mode designating means for designating a first mode and a second mode, and a method wherein a plurality of terminals are directly connected to perform communication when the first mode is designated. There is provided a communication apparatus comprising: connection instruction means for instructing, when the second mode is designated, to connect and communicate with a plurality of terminals via a server.
According to still another aspect of the present invention, a number designation step for designating the number of persons to communicate with each other, and when two persons are designated, an instruction is given to directly connect two terminals to carry out communication. A connection instructing step of instructing connection of three or more terminals via a server to perform communication when more than one person is designated.
According to still another aspect of the present invention, a mode designating step of designating a first mode and a second mode, and when the first mode is designated, a plurality of terminals are directly connected to perform communication. And a connection instructing step of instructing a plurality of terminals to communicate with each other via a server when the second mode is designated.
According to still another aspect of the present invention, a number designation step for designating the number of persons to communicate with each other, and when two persons are designated, an instruction is given to directly connect two terminals to carry out communication. A connection instructing step of instructing a computer to connect to three or more terminals via a server when more than one person is designated is provided, and a program for causing the computer to execute the steps.
According to still another aspect of the present invention, a mode designating step of designating a first mode and a second mode, and when the first mode is designated, a plurality of terminals are directly connected to perform communication. And instructing the computer to perform communication by connecting a plurality of terminals via the server when the second mode is designated.
[0008]
According to the present invention, an instruction is given to directly connect a plurality of terminals or to connect a plurality of terminals via a server to perform communication according to the number of people or the mode. For example, when two people are designated, high-speed communication can be performed by directly connecting the two terminals. When three or more terminals are specified, the load on each terminal can be reduced by connecting three or more terminals via the server.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 show a configuration of a communication device according to an embodiment of the present invention.
FIG. 1 shows communication in the two-person mode. The two terminals 110 and 120 are directly connected and mutually exchange performance data, audio data, and video data so that the two players can perform an ensemble at a remote location. For example, the terminal 110 is a server, and the terminal 120 is a client. Each of the terminals 110 and 120 has a keyboard 101, a sound source 102, a microphone 103, a speaker 104, a camera 105, and a display 106.
[0010]
When the performer plays the keyboard (electronic musical instrument) 101, the keyboard 101 generates performance data and supplies it to the terminal 110. The performance data is, for example, MIDI (Musical Instrument Digital Interface) data. When receiving MIDI data from the keyboard 101, the terminal 110 outputs the MIDI data to the sound source 102 and transmits the MIDI data to the terminal 120 via the Internet (network) 130. The sound source 102 generates a tone signal based on the MIDI data, and causes the speaker 104 to emit a tone. Similarly, at the terminal 120, a musical tone is generated by the sound source 102 and the speaker 104.
[0011]
The microphone 103 generates an audio signal based on a voice such as a singing voice of the player and outputs the audio signal to the terminal 110. When the terminal 110 inputs an analog audio signal from the microphone 103, the terminal 110 converts the analog audio signal into digital audio data, causes the speaker 104 to generate a sound, and transmits the sound to the terminal 120 via the Internet 130. Similarly, at the terminal 120, a sound is generated from the speaker 104.
[0012]
The camera 105 generates video data such as a performer or a musical score, and outputs the video data to the terminal 110. When the terminal 110 receives video data from the camera 105, it displays the video data on the display 106 and transmits the video data to the terminal 120 via the Internet 130. Similarly, at the terminal 120, an image is displayed on the display 106.
[0013]
Similarly, in the terminal 120, the generated MIDI data, audio data, and video data are reproduced and transmitted to the terminal 110. In the terminal 110, the same MIDI data, audio data, and video data are reproduced. Thereby, two players can perform ensemble in real time in a remote place.
[0014]
In an environment of the Internet 130, the terminals 110 and 120 communicate audio data and video data via a TCP (Transmission Control Protocol) port 131, and communicate MIDI data via a UDP (User Datagram Protocol) port 132. . MIDI data requires higher speed (real-time performance) than audio data and video data. Therefore, MIDI data uses the UDP port 132, and audio data and video data use the TCP port 131. Only the UDP port may be used without separating the TCP port 131 and the UDP port 132. In this case, it is preferable to assign a priority to the data so that the MIDI data is transmitted and received with priority. Note that, in the two-person mode, of the two terminals 110 and 120, the one that requests connection first becomes the server, and the other becomes the client.
[0015]
FIG. 2 shows communication in the three or more mode. The four terminals 211 to 214 are connected via the session server 260 so that the four performers can play ensemble at remote locations, and mutually exchange performance data, audio data, and video data. If there are three or more, this mode is set, but the case of four will be described as an example. The four terminals 211 to 214 are all clients, and the session server 260 is a server. Each of the terminals 211 to 214 has a keyboard 101, a sound source 102, a microphone 103, a speaker 104, a camera 105, and a display 106, as in FIG.
[0016]
The terminals 211 to 214 and the session server 260 are connected via the Internet (network) 250. Under the Internet 250 environment, the terminals 211 to 214 communicate audio data and video data via the TCP port 251 and communicate MIDI data via the UDP port 252. The terminals 211 to 214 mutually communicate MIDI data, audio data, and video data via the session server 260. Thereby, three or more (for example, four) performers can perform ensemble in real time in a remote place.
[0017]
3A to 3C show a processing method of the session server 260 in FIG. For example, four terminals A, B, C, and D are connected to the session server 260.
[0018]
FIG. 3A shows a method of processing the MIDI data by the session server 260. When a key is pressed on the keyboard of terminal A, terminal A transmits MIDI data to session server 260. The session server 260 transmits the MIDI data received from the terminal A to the terminals B, C, and D. Similar processing is performed when the session server 260 receives MIDI data from the terminals B, C, and D.
[0019]
FIG. 3B shows a method of processing audio data by the session server 260. The terminals A, B, C, and D generate ADPCM data obtained by compressing audio data at predetermined time intervals, and transmit the data to the session server 260. The session server 260 expands, adds, and recompresses the ADPCM data received from the terminals B, C, and D, and transmits the ADPCM data to the terminal A. The session server 260 transmits voice data to the terminals B, C, and D in the same manner.
[0020]
FIG. 3C shows a video data processing method of the session server 260. The terminals A, B, C, and D generate JPEG data obtained by compressing video data at predetermined time intervals, and transmit the JPEG data to the session server 260. The session server 260 expands the JPEG data received from the terminals B, C, and D, synthesizes and recompresses the data, and transmits the JPEG data to the terminal A. The session server 260 transmits video data to the terminals B, C, and D in the same manner. The terminal A can display images of the players of the terminals B, C, and D in addition to the image of the player of the terminal A. Note that the header of the video data includes terminal identification information and coordinate data necessary for decomposing the composite image. When the size of the video data is a default value, the coordinate data is not always necessary. This header is also used for communication in the two-person mode (FIG. 1).
[0021]
As described above, since the session server 260 combines the data and transmits the data to each terminal, the amount of communication data can be reduced.
[0022]
As shown in FIG. 1, when ensemble is performed by two terminals, the two terminals are directly connected to perform communication. If the terminals are directly connected, high-speed communication can be performed. However, when three or more terminals are directly connected, the load increases because each terminal communicates with a plurality of terminals. Therefore, as shown in FIG. 2, when ensemble is performed by three or more terminals, communication is performed by connecting three or more terminals via the session server 260. When terminals are connected via the session server 260, each terminal only needs to communicate with the session server 260, so that the load on each terminal can be reduced.
[0023]
FIG. 4 shows the flow of data processing in the two-person mode (FIG. 1). The vertical axis is time. The left column shows the process of the first terminal 410, and the right column shows the process of the second terminal 420.
[0024]
First, MIDI data will be described. When the key is depressed on the first terminal 410, the first terminal 410 transmits the MIDI data to the second terminal 420, and performs sound generation processing. The second terminal 420 receives the MIDI data and performs sound generation processing. Further, when the key is released by the first terminal 410, the first terminal 410 transmits the MIDI data to the second terminal 420, and performs a silencing process. The second terminal 420 receives the MIDI data and performs a mute process.
[0025]
Similarly, when a key is depressed on the second terminal 420, the second terminal 420 transmits MIDI data to the first terminal 410 and performs sound generation processing. The first terminal 410 receives the MIDI data and performs sound generation processing. Further, when the key is released by the second terminal 420, the second terminal 420 transmits the MIDI data to the first terminal 410, and performs a sound mute processing. The first terminal 410 receives the MIDI data and performs a mute process.
[0026]
Next, audio data will be described. The audio data is recorded in a recording buffer. At every predetermined interval (for example, 0.45 seconds) 401, the recording buffer becomes full and is reproduced. When the recording buffer becomes full at the first terminal 410, the first terminal 410 encodes the audio data and sends it to the second terminal 420. The second terminal 420 receives the audio data, decodes it, sets it in a reproduction buffer, and reproduces it. Similarly, when the recording buffer becomes full at the second terminal 420, the second terminal 420 encodes the audio data and transmits it to the first terminal 410. First terminal 410 receives the audio data, decodes the data, sets the data in a reproduction buffer, and reproduces the data.
[0027]
Next, the video data will be described. For the video data, a camera capture command is issued at predetermined intervals (for example, 0.5 seconds) 402. When the first terminal 410 issues a capture command, the first terminal 410 JPEG-compresses the video data, transmits it to the second terminal 420, and displays the video data. The second terminal 420 receives the JPEG data, decompresses and displays the JPEG data. Similarly, when the second terminal 420 issues a capture command, the second terminal 420 JPEG-compresses the video data, transmits the JPEG-compressed video data to the first terminal 410, and displays the video data. The first terminal 410 receives the JPEG data, decompresses and displays the JPEG data.
[0028]
FIG. 5 shows an example of a connection screen displayed on each terminal. When the terminal accesses the connection server (fixed IP address) 903 (FIGS. 9A to 9E), the room information and the member information stored therein are displayed on the connection screen. On the connection screen, a “double room creation” button 501 and a “quad room creation” button 502 are displayed. To play the ensemble together, button 501 is clicked on with a mouse. Then, the connection in the two-person mode of FIG. 1 is automatically performed. To play the ensemble with four people, button 502 is clicked on with a mouse. Then, the connection in the three or more mode of FIG. 2 is automatically performed.
[0029]
FIG. 6 shows a screen example in which five groups are generated. The group number, the room mode, the availability, and the members are displayed for the five groups. For example, in the case of the group number “1”, the room mode is “four-person room”, the member is only “A”, and the availability is “three-person available”. That is, three more people can join. For example, when the member A clicks the button 502 on the screen in FIG. 5, a room with the group number “1” is newly created. When one of the group numbers 1 to 5 that have already been created is selected and the entry button 503 is clicked, the user can join (enter) the group.
[0030]
As described above, when the double room creation button 501 is clicked, the terminal (user) starts up as the server 110 (FIG. 1) and waits for someone to enter the room. At this time, the IP address and the member name of the terminal are registered in the connection server 903, and the member information and the room information are updated.
[0031]
When a quadruple room creation button 502 is clicked, the terminal is connected to the session server (fixed IP address) 260 as a client, and waits for someone to enter the room. Also here, the IP address and the member name of the terminal are registered in the connection server, and the member information and the room information are updated.
[0032]
When a group (room) is selected and the entry button 503 is clicked, connection to the selected group is established. When the room is a double room, the terminal is connected to the IP address of the terminal (member) in the room. If the room is a quadruple room, it is connected to a session server (IP address fixed) 260. Also at this time, the IP address and the member name of the terminal are registered in the connection server, and the member information and the room information are updated.
[0033]
FIG. 7 shows another example of the connection screen instead of FIG. On this connection screen, a double room creation button 701 and a room creation button 702 for three or more people are displayed. To play the ensemble together, the button 701 is clicked. Then, the connection in the two-person mode of FIG. 1 is performed. When the ensemble is performed by three or more people, the button 702 is clicked. Then, the connection in the three or more mode of FIG. 2 is performed. When button 702 is clicked, window 703 is further displayed. The user inputs the capacity on the window 703.
[0034]
FIG. 8 shows still another example of the connection screen instead of FIG. On this connection screen, a new room creation button 801 is displayed. When the button 801 is clicked, a window 802 is further displayed. The user enters a capacity on window 802. When the capacity is two, the connection in the two-person mode of FIG. 1 is performed. When the number of persons is three or more, connection in the three or more persons mode of FIG. 2 is performed.
[0035]
9A to 9E show a direct connection method in the two-person mode (FIG. 1). A case where two terminals 901 and 902 are directly connected and ensemble will be described as an example.
[0036]
First, in FIG. 9A, the first terminal 901 transmits a list request to the connection server 903. Then, the connection server 903 reads the stored room information and member information, and transmits the list to the first terminal 901. The first terminal 901 displays, for example, the screen of FIG. 6 according to the received list.
[0037]
Next, in FIG. 9B, when the double room creation button 501 is clicked on the first terminal 901, the first terminal 901 transmits a message to that effect and its own IP address to the connection server 903. . Then, the connection server 903 registers the received information. The first terminal 901 then starts up in the server mode and waits for a connection from another terminal.
[0038]
Next, in FIG. 9C, the second terminal 902 transmits a list request to the connection server 903, similarly to the first terminal 901. Then, the connection server 903 reads the stored room information and member information, and transmits the list to the second terminal 902. The second terminal 902 displays, for example, the screen of FIG. 6 according to the received list. At this stage, the first terminal 901 has already been registered as a member.
[0039]
Next, in FIG. 9D, when the group of the first terminal 901 is selected on the second terminal 902 and the entry button 503 is clicked, the second terminal 902 connects to that effect and its own IP address. To the application server 903. Then, the connection server 903 registers the received information, and transmits the IP address of the first terminal 901 to the second terminal 902 as a connection destination address. The second terminal 902 receives the connection destination address.
[0040]
Next, in FIG. 9E, the second terminal 902 can directly connect to the first terminal 901 by accessing the above connection destination address. The first terminal 901 is a server, and the second terminal 902 is a client. Accordingly, a TCP / IP connection is established and maintained between the two terminals 901 and 902. Thereafter, by performing the ensemble, communication is performed between the terminals 901 and 902.
[0041]
FIGS. 10A to 10D show a connection method via a session server in the three or more mode (FIG. 2). Although three or more terminals are connected via the session server, for simplicity of explanation, a case where two terminals 1001 and 1002 are connected via the session server 1004 and ensemble will be described as an example.
[0042]
First, in FIG. 10A, the first terminal 1001 transmits a list request to the connection server 1003. Then, the connection server 1003 reads the stored room information and member information, and transmits the list to the first terminal 1001. The first terminal 1001 displays, for example, the screen of FIG. 6 according to the received list.
[0043]
Next, in FIG. 10B, when the quadruple room creation button 502 is clicked on the first terminal 1001, the first terminal 1001 transmits a message to that effect and its own IP address to the connection server 1003. . Then, the connection server 1003 registers the received information, and transmits the IP address of the session server 1004, the created group ID (group number), and the member ID of the terminal 1001 to the first terminal 1001. First terminal 1001 receives the information.
[0044]
Next, in FIG. 10C, the first terminal 1001 connects to the session server 1004 using the acquired IP address, group ID, and member ID of the session server. Thus, a TCP / IP connection is established and maintained between the first terminal 1001 and the session server 1004.
[0045]
Next, in FIG. 10D, the second terminal 1002 receives the IP address, the group ID, and the member ID as in the procedure of the first terminal 1001. However, instead of clicking the quadruple room creation button 502, the user selects the group of the first terminal 1001 and clicks the entry button 503 to enter the room. Next, the second terminal 1002 connects to the session server 1004 using the acquired IP address, group ID, and member ID of the session server. Thus, a TCP / IP connection is established and maintained between the second terminal 1002 and the session server 1004. The first terminal 1001 and the second terminal 1002 are connected via a session server 1004. Thereafter, by performing the ensemble, communication is performed between the terminals 1001 and 1002 via the session server 1004.
[0046]
FIG. 11 is a hardware configuration diagram of a computer of the terminal, the session server, and the connection server. A central processing unit (CPU) 1102, a ROM 1103, a RAM 1104, a network interface 1105, an input device 1106, an output device 1107, and an external storage device 1108 are connected to the bus 1101.
[0047]
The CPU 1102 performs data processing and calculation, and controls the above-described constituent units connected via the bus 1101. A boot program is stored in the ROM 1103 in advance, and the computer is started up when the CPU 1102 executes the boot program. A computer program is stored in the external storage device 1108, and the computer program is copied to the RAM 1104 and executed by the CPU 1102. This computer can perform the above processing by executing a computer program.
[0048]
The external storage device 1108 is, for example, a hard disk storage device or the like, and does not lose its stored contents even when the power is turned off. The external storage device 1108 can record a computer program, MIDI data, audio data, video data, and the like on a recording medium, and can read a computer program and the like from the recording medium.
[0049]
The network interface 1105 can send and receive MIDI data, audio data, video data, computer programs, and the like to and from a network (the Internet). The input device 1106 is, for example, a keyboard and a pointing device (mouse), and can perform various designations or inputs. The output device 1107 is a display or the like, and displays, for example, the screen of FIG.
[0050]
This embodiment can be realized by a computer executing a program. Further, means for supplying the program to the computer, for example, a computer-readable recording medium such as a CD-ROM in which the program is recorded or a transmission medium such as the Internet for transmitting the program is also applied as an embodiment of the present invention. Can be. Further, a computer program product such as a computer-readable recording medium on which the above-described program is recorded can also be applied as an embodiment of the present invention. The above programs, recording media, transmission media, and computer program products are included in the scope of the present invention. As the recording medium, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, and the like can be used.
[0051]
As described above, according to the present embodiment, an instruction is given to perform communication by directly connecting a plurality of terminals or connecting a plurality of terminals via a server according to the number of people or the mode. For example, when two people are designated, high-speed communication can be performed by directly connecting the two terminals. When three or more terminals are specified, the load on each terminal can be reduced by connecting three or more terminals via the session server. In any of the two-person mode and the three or more-person mode, the processing of the terminal at the time of the ensemble is similar, and the processing is not complicated. The user can make an optimal connection without being aware of where his or her terminal is connected.
[0052]
Instead of connecting the keyboard to the terminal, another electronic musical instrument may be connected. The connection between the terminals is not limited to the Internet, but may be another network.
[0053]
Each of the above-described embodiments is merely an example of a specific embodiment for carrying out the present invention, and the technical scope of the present invention should not be interpreted in a limited manner. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features.
[0054]
【The invention's effect】
As described above, an instruction is given to directly connect a plurality of terminals or to connect a plurality of terminals via a server to perform communication according to the number of people or the mode. For example, when two people are designated, high-speed communication can be performed by directly connecting the two terminals. When three or more terminals are specified, the load on each terminal can be reduced by connecting three or more terminals via the server.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration example of a two-person mode communication device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a configuration example of a communication device in a mode of three or more users according to an embodiment of the present invention.
FIGS. 3A to 3C are diagrams showing a processing method of a session server.
FIG. 4 is a diagram showing a flow of data processing in a two-person mode (FIG. 1).
FIG. 5 is a diagram showing an example of a connection screen displayed on each terminal.
FIG. 6 is a diagram showing another example of a connection screen displayed on each terminal.
FIG. 7 is a diagram showing another example of a connection screen displayed on each terminal.
FIG. 8 is a diagram showing another example of a connection screen displayed on each terminal.
FIGS. 9A to 9E are diagrams showing a direct connection method in the two-person mode (FIG. 1).
FIGS. 10A to 10D are diagrams showing a connection method via a session server in a mode of three or more users (FIG. 2).
FIG. 11 is a hardware configuration diagram of a computer of a terminal, a session server, and a connection server.
[Explanation of symbols]
101 keyboard
102 sound source
103 microphone
104 speaker
105 camera
106 Display
110, 120 terminals
130 Internet
131 TCP port
132 UDP port
211-214 terminal
250 Internet
251 TCP port
252 UDP port
260 Session Server
1101 Bus
1102 CPU
1103 ROM
1104 RAM
1105 Network interface
1106 Input device
1107 Output device
1108 External storage device

Claims (26)

A number designation means for designating the number of people communicating with each other;
When two people are designated, it is instructed to connect two terminals directly to perform communication, and when three or more people are designated, three or more terminals are connected via a server to perform communication. A communication device having a connection instructing means for instructing. 2. The communication device according to claim 1, further comprising a server for connecting and communicating with three or more terminals according to the instruction. 3. The communication device according to claim 2, further comprising two or more terminals for performing the mutual communication. The communication device according to claim 3, wherein the terminal communicates performance data, audio data, or video data. The communication device according to claim 4, wherein the terminal performs communication of at least MIDI data. The communication device according to claim 4, wherein the terminal performs communication of at least voice data. The communication device according to claim 4, wherein the terminal performs at least communication of video data. The communication device according to claim 4, wherein the terminal communicates MIDI data, audio data, and video data. The communication device according to claim 5, further comprising an electronic musical instrument for supplying MIDI data to the terminal. 7. The communication device according to claim 6, further comprising a microphone for supplying audio data to the terminal. The communication device according to claim 7, further comprising a camera for supplying video data to the terminal. Mode designating means for designating a first mode and a second mode;
When the first mode is specified, an instruction is given to directly connect a plurality of terminals to perform communication, and when the second mode is specified, a plurality of terminals are connected via a server to perform communication. And a connection instructing means for instructing the communication. The communication device according to claim 12, further comprising a server for connecting and communicating with a plurality of terminals according to the instruction. 14. The communication device according to claim 13, further comprising a plurality of terminals for communicating with each other. The communication device according to claim 14, wherein the terminal communicates performance data, audio data, or video data. The communication device according to claim 15, wherein the terminal performs communication of at least MIDI data. The communication device according to claim 15, wherein the terminal performs at least communication of voice data. The communication device according to claim 15, wherein the terminal performs at least communication of video data. The communication device according to claim 15, wherein the terminal performs communication of MIDI data, audio data, and video data. 17. The communication device according to claim 16, further comprising an electronic musical instrument for supplying MIDI data to the terminal. The communication device according to claim 17, further comprising a microphone for supplying audio data to the terminal. 19. The communication device according to claim 18, further comprising a camera for supplying video data to the terminal. A number specifying step for specifying the number of persons to communicate with each other;
When two people are designated, it is instructed to connect two terminals directly to perform communication, and when three or more people are designated, three or more terminals are connected via a server to perform communication. And a connection instructing step of instructing. A mode designation step of designating a first mode and a second mode;
When the first mode is specified, an instruction is given to directly connect a plurality of terminals to perform communication, and when the second mode is specified, a plurality of terminals are connected via a server to perform communication. And a connection instructing step for instructing the communication. A number specifying step for specifying the number of persons to communicate with each other;
When two people are designated, it is instructed to connect two terminals directly to perform communication, and when three or more people are designated, three or more terminals are connected via a server to perform communication. A program for causing a computer to execute a connection instruction step for instructing. A mode designation step of designating a first mode and a second mode;
When the first mode is specified, an instruction is given to directly connect a plurality of terminals to perform communication, and when the second mode is specified, a plurality of terminals are connected via a server to perform communication. Program for causing a computer to execute a connection instruction step instructing the computer to perform the following steps.

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