JP6254067B2 - Inter-terminal communication system, server, and inter-terminal communication method - Google Patents

Description

  Embodiments described herein relate generally to an inter-terminal communication system, a server, and an inter-terminal communication method.

  Conventionally, data communication by which voice data and image data can be mutually processed in real time between callers using these portable terminal devices by transmitting and receiving voice data and image data to and from each other. A system is known (see, for example, Patent Document 1).

JP 2000-261574 A

  In the data communication system as described above, personal information may be exchanged between portable terminal devices. For this reason, in such a data communication system, a secure communication environment is required. However, in the data communication system as described above, a secure communication environment has not been provided. In particular, a secure communication environment between three or more terminal devices has not been provided.

  An object of the present invention is to provide an inter-terminal communication system, a server, and an inter-terminal communication method capable of transmitting and receiving audio data and image data between terminal devices in real time in a secure communication environment.

One embodiment of the present invention includes a terminal information receiving unit that receives terminal information including terminal identification information for identifying a terminal device and application identification information for identifying an application operating on the terminal device, from the terminal device; A session is established between a first application that operates on the first terminal device among the terminal devices and a second application that operates on a second terminal device different from the first terminal device among the plurality of terminal devices. Compatibility of the session construction unit, the first application, and a third application that operates in a third terminal device different from the first terminal device and the second terminal device among the plurality of terminal devices, A compatibility determination unit for determining based on the identification information or the application identification information, and the first application A determination result transmission unit that transmits a determination result by the suitability determination unit to the first application in response to an information sharing request transmitted by the session, wherein the session is based on key information corresponding to the session. The session constructing unit is configured to perform a session between the first application and the third application in response to a request to start communication with the third application transmitted by the first application. Based on the terminal information of the device and the terminal information of the third terminal device, a peer-to-peer mode session is established in which the first terminal device and the second terminal device communicate directly. when the third in response to a request of a voice communication to the first terminal apparatus from the terminal apparatus, portable information shared among the plurality of terminal devices A communication to share information session on to create the key information corresponding between communication with the first application to the relay server for relaying to the second application, the first terminal from the relay server apparatus and the second based on the key information transmitted to the terminal device constructed to switch from session of the peer-to-peer mode, the session of the relay mode via the relay server between the second application and the first application And between terminals that establish the session in the relay mode between the first application and the third application based on the key information corresponding to the session between the first application and the second application. It is a communication system.

  Further, in the inter-terminal communication system according to the embodiment of the present invention, the session constructing unit responds to the communication start request with the third application transmitted by the first application, and the second application and the first application. A session with three applications is constructed based on the terminal information of the second terminal device and the terminal information of the third terminal device.

  Further, in the inter-terminal communication system according to an embodiment of the present invention, the session construction unit includes the second application based on second terminal identification information identifying the second terminal device transmitted from the first application. And a session between the third application and the third application.

  In the inter-terminal communication system according to an embodiment of the present invention, the first application determines whether to transmit information received from either the second application or the third application to the other application. A transmission determination unit that performs the transmission determination.

In addition, according to an embodiment of the present invention, a terminal information receiving unit that receives terminal information including terminal identification information for identifying a terminal device and application identification information for identifying an application operating in the terminal device from the terminal device; A session between a first application that operates on a first terminal device among the plurality of terminal devices and a second application that operates on a second terminal device different from the first terminal device among the plurality of terminal devices. The compatibility between the session construction unit that constructs the first application, and a third application that operates in a third terminal device different from the first terminal device and the second terminal device among the plurality of terminal devices, A suitability determination unit for determining based on the terminal identification information or the application identification information; A determination result transmission unit that transmits a determination result by the suitability determination unit to the first application in response to an information sharing request transmitted by the application, wherein the session is based on key information corresponding to the session. The session constructing unit is configured to perform a session between the first application and the third application in response to a request to start communication with the third application transmitted by the first application. Based on the terminal information of the device and the terminal information of the third terminal device, a peer-to-peer mode session is established in which the first terminal device and the second terminal device communicate directly. when the third in response to a request of a voice communication to the first terminal apparatus from the terminal apparatus, information both between the plurality of terminal devices A communication that allows information sharing session on to create the key information corresponding between communication with the first application to the relay server for relaying to the second application, the first terminal device and said from said relay server based on the key information transmitted to the second terminal device, between the peer-to-peer mode is switched from the session of the session relay mode via the relay server said first application and said second application And constructing the relay mode session between the first application and the third application based on the key information corresponding to the session between the first application and the second application. It is a server.

One embodiment of the present invention is an inter-terminal communication method in an inter-terminal communication system including a terminal device and a server, wherein the server operates in the terminal identification information for identifying the terminal device and the terminal device. A first step of receiving terminal information including application identification information for identifying an application to be performed from the terminal device, a first application that operates on the first terminal device among the plurality of terminal devices, and a plurality of A second step of establishing a session with a second application that operates on a second terminal device different from the first terminal device among the terminal devices; and the server includes the first application and a plurality of the terminals. 3rd application which operate | moves in 3rd terminal device different from the said 1st terminal device and 2nd terminal device among apparatuses A third step of determining compatibility with the application based on the terminal identification information or the application identification information, and the server in response to a request for information sharing transmitted by the first application in the third step A fourth step of transmitting a determination result to the first application, and the server responding to a request for starting communication with the third application transmitted by the first application, the first application and the third application; And a fifth step of constructing a session between the first terminal device and the third terminal device based on the terminal information of the first terminal device and the terminal information of the third terminal device. When a session in peer-to-peer mode is established, in which the third terminal device directly communicates with In response to a request of a voice communication to the first terminal apparatus, a plurality of the terminal device said first application and said second application to the relay server for relaying information sharing communication is a communication that allows information shared between Switch from the peer-to-peer mode session based on the key information transmitted from the relay server to the first terminal device and the second terminal device. Te, along with building a session relay mode via the relay server between the second application and the first application, said key information corresponding to the session between the first application and the second application Based on the relay mode between the first application and the third application. This is an inter-terminal communication method for constructing a session.

  According to the present invention, it is possible to provide an inter-terminal communication system, a server, and an inter-terminal communication method capable of transmitting and receiving audio data and image data between terminal devices in real time in a secure communication environment.

It is a schematic diagram which shows an example of a structure of the terminal device of this embodiment. It is a schematic diagram which shows an example of the outline | summary of the information sharing function which the communication system between terminals of this embodiment provides. It is a schematic diagram which shows the 1st example of selection operation of the information sharing function which the communication system between terminals of this embodiment provides. It is a schematic diagram which shows an example of a structure of the communication system between terminals of this embodiment. It is a table | surface which shows an example of the registration information which the signaling server of this embodiment memorize | stores. It is a flowchart which shows an example of the operation | movement procedure of the registration of this embodiment. It is a flowchart which shows an example of the operation | movement procedure of the session construction in P2P mode of this embodiment. It is a 1st flowchart which shows an example of the operation | movement procedure of the session construction in the relay mode of this embodiment. It is a 2nd flowchart which shows an example of the operation | movement procedure of the session construction in the relay mode of this embodiment. It is FIG. 1 of the 1st schematic diagram which shows the outline | summary of provision of the three-way information sharing function by the communication system between terminals of this embodiment. It is FIG. 2 of the 1st schematic diagram which shows the outline | summary of provision of the tripartite information sharing function by the communication system between terminals of this embodiment. It is a 2nd schematic diagram which shows the outline | summary of provision of the three-way information sharing function by the communication system between terminals of this embodiment. It is a 3rd schematic diagram which shows the outline | summary of provision of the tripartite information sharing function by the communication system between terminals of this embodiment.

[Embodiment]
Hereinafter, an embodiment of the inter-terminal communication system 1 according to the present embodiment will be described with reference to the drawings.
The inter-terminal communication system 1 of the present embodiment provides an information sharing function among a plurality of terminal devices 10. The terminal device 10 here is a communication device that can communicate with each other by voice or text, and is, for example, a mobile phone or a smartphone. The terminal device 10 can be connected to a high-speed data communication line capable of transmitting and receiving voice information and image information through the same line. The high-speed data communication line is, for example, an LTE (Long Term Evolution) communication network. This high-speed data communication line provides a service (VoLTE; Voice over LTE) that enables voice calls in addition to transmission and reception of digital information such as images and characters.

  The information sharing function is a function for sharing image information or audio information among a plurality of terminal devices 10. More specifically, a certain terminal device 10 transmits image information or audio information to another terminal device 10. Accordingly, the inter-terminal communication system 1 displays or reproduces the image displayed on the transmission-side terminal device 10 or the sound being reproduced on the reception-side terminal device 10. The inter-terminal communication system 1 provides not only a one-way information sharing function from one terminal apparatus 10 to another terminal apparatus 10 but also a two-way information sharing function between the terminal apparatuses 10.

When information sharing is performed by three or more terminal devices 10 in the inter-terminal communication system 1, there are a first sharing method and a second sharing method as information sharing methods.
In the first sharing method, the terminal device 10 on the information transmission side transmits the same image information or audio information to the terminal device 10 on the information reception side. Then, the terminal device 10 on the information receiving side performs image display or audio reproduction based on the received image information or audio information, respectively. That is, in the first sharing method, all the terminal devices 10 included in the inter-terminal communication system 1 can reproduce the same information.
In the second sharing method, the terminal device 10 on the information transmission side transmits different image information or audio information for each terminal device 10 on the information reception side. Then, the terminal device 10 on the information receiving side performs image display or audio reproduction based on the received image information or audio information, respectively. That is, in the second sharing method, information reproduced in the plurality of terminal devices 10 included in the inter-terminal communication system 1 may be different. However, a pair consisting of at least two terminal devices 10 of the information transmission side terminal device 10 and the information reception side terminal device 10 reproduces the same information.

  That is, the inter-terminal communication system 1 can share image information or audio information not only in two but also in three or more inter-terminal communication systems 1. Hereinafter, an information sharing function in three or more terminal devices 10 may be referred to as a “three-party information sharing function”. On the other hand, the information sharing function in the two terminal devices 10 may be referred to as a “bilateral information sharing function”. Moreover, below, although the three-way information function by the three terminal devices 10 is demonstrated as an example, the terminal device 10 may be four or more.

  The inter-terminal communication system 1 includes a plurality of terminal devices 10. In the following description, when distinguishing each of the plurality of terminal devices 10, for example, they are described as a terminal device 10A and a terminal device 10B. Moreover, in the following description, when not distinguishing each of these several terminal devices 10, it describes as the terminal device 10 only. The configuration of the terminal device 10 will be described with reference to FIG.

[Configuration of terminal device]
FIG. 1 is a schematic diagram illustrating an example of a configuration of the terminal device 10 according to the present embodiment. The terminal device 10 includes a display unit 100, an operation detection unit 110, an imaging unit 120, a sound reproduction unit 130, a sound collection unit 140, a communication unit 150, and a control unit 160.

  The display unit 100 includes a liquid crystal display and displays images such as characters and photographs. The image displayed by the display unit 100 is for a user to select a standby image displayed when waiting for an incoming call, an application image provided by an application operating on the terminal device, and various functions provided by the terminal device. Menu images and so on.

  This application image includes a dialer image provided by a telephone (voice communication) application, and an address book image provided by an address book application that manages names, telephone numbers, and mail addresses. In addition, the application image includes a moving image provided by the moving image reproduction application, a web image provided by the web browser application, a map image provided by the map application, and a photo image provided by the photo album application. The application image includes various images such as a mail text image provided by the e-mail application and a chat image provided by the text chat application.

  Of the menu images displayed on the display unit 100, the menu image for selecting the information sharing function is particularly referred to as an information sharing menu image. The information sharing menu image is also referred to as a shared menu ball image or a shared menu button image. Here, the menu includes various menus in addition to the information sharing menu.

  Returning to FIG. 1, the operation detection unit 110 includes a transparent touch panel sensor that covers the display unit 100, and detects a user operation. There are various types of user operations. Examples of operation types include a tap operation, a drag operation, and a pinch operation. The tap operation is an operation in which the user releases the finger immediately after touching the finger at a position where the touch panel is located. The drag operation is an operation in which the user moves a finger touching the touch panel in a certain direction while touching the touch panel. The pinch operation is an operation in which the user changes the interval between two fingers that touch the touch panel. The tap operation includes a single tap operation that is touched only once and a double tap operation that repeats the single tap operation twice quickly. Further, the drag operation includes a swipe operation in which the moving speed is faster than that of the drag operation and a faster flick operation. The pinch operation includes a pinch-out operation that increases the interval between two fingers that touch the touch panel, and a pinch-in operation that decreases the interval between two fingers that touch the touch panel.

  Here, the case where the user performs an operation by touching the touch panel sensor with a finger has been described as an example, but the present invention is not limited thereto. For example, the user may operate using an operation indicator bar instead of a finger. That is, the operation detection unit 110 detects an operation with a finger or an object other than the finger (for example, a pointing stick) as a user operation.

  The sound reproducing unit 130 includes a speaker and reproduces sound based on input sound information. The sound reproducing unit 130 includes an ear-talking speaker 131 and a speaker mode speaker 132. The ear-talking speaker 131 is used when the terminal device 10 is placed on the user's ear to make a call. The speaker mode speaker 132 is used when sound is reproduced while the terminal device 10 is spoken from the ear.

  The sound collection unit 140 includes a microphone, collects sounds around the terminal device 10, and converts the collected sounds into sound information. The sounds around the terminal device 10 include the noise around the terminal device 10, the sound that the user is making to make a call, and the sound that is produced by the speaker of the sound reproducing unit 130. That is, the sound collection unit 140 collects various sounds such as noise around the terminal device 10, the voice of the user during a call, and the sound emitted from the speaker of the terminal device 10.

  The communication unit 150 includes a communication control IC (Integrated Circuit), and performs communication with other devices. The terminal device 10 communicates with other devices by the communication operation by the communication unit 150. In the following description, description of the configuration and operation of the communication unit 150 is omitted.

  The control unit 160 includes a CPU (Central Processing Unit) and controls each unit included in the terminal device 10. The terminal device 10 performs operations such as display on the display unit 100, detection of an operation by the operation detection unit 110, communication with another device by the communication unit 150, and the like by the control of each unit by the control unit 160. In the following description, description of the configuration and operation of the control unit 160 is omitted.

[Overview of information sharing function]
Next, an outline of the information sharing function provided by the inter-terminal communication system 1 will be described with reference to FIG.
FIG. 2 is a schematic diagram illustrating an example of an overview of an information sharing function provided by the inter-terminal communication system 1. Examples of the information sharing function provided by the inter-terminal communication system 1 include a function for sharing an image being displayed, a function for sharing a handwritten image, a function for sharing position information, and an image captured by a camera. There is a function.

  These information sharing functions are provided by an information sharing function application that operates on the terminal device 10. The information sharing function application provides an information sharing function by operating in cooperation with the basic software in the terminal device 10 and other applications.

Here, the basic software in the terminal device 10 with which the information sharing function application cooperates includes communication software for the terminal device 10 to communicate with other devices. Other applications in the terminal device 10 with which the information sharing function application cooperates include a basic address book application and an image sharing address book application.
Here, the case where the terminal device 10 is compatible with the information sharing function refers to the case where the terminal device 10 has installed an application that provides the information sharing function. Further, the case where the terminal device 10 does not support the information sharing function refers to a case where the terminal device 10 does not install an application that provides the information sharing function.

  Here, in describing the information sharing function, a description method of the terminal device 10 in the description of the present embodiment will be described. The terminal device 10 is classified into a terminal device 10 that transmits information to be shared, and a terminal device 10 that receives information to be shared. In the following description, the terminal device 10 that transmits information to be shared among the plurality of terminal devices 10 is also referred to as an information transmitting terminal device 10 or a terminal device 10-S. Further, the terminal device 10 on the information receiving target side is also referred to as an information receiving terminal device 10 or a terminal device 10-R. The terminal device 10 on the information receiving side and the terminal device 10 on the information transmitting side may be interchanged. Specifically, the terminal device 10 on the information receiving side requests the terminal device 10 on the information transmitting side to permit transmission of information from the own device. When the transmission is permitted by the terminal device 10 on the information transmission side, the terminal device 10 that has been functioning as the information reception side until then functions as the terminal device 10 on the information transmission side. Further, the terminal device 10 that has been functioning as the information transmitting side until then functions as the terminal device 10 on the information receiving side.

  Of the terminal device 10 that requests information sharing (requesting side) and the terminal device 10 that requests information sharing (requested side), which transmits information to be shared, Whether this information is received depends on the functional difference between the information sharing functions, the operating state of the terminal device 10, and the like. That is, in the inter-terminal communication system 1, there are a case where the requesting terminal device 10 transmits information to be shared information and a case where the requested terminal device 10 transmits information to be shared information.

[Information sharing function: Sharing the displayed image (display screen sharing function)]
Next, an overview of the information sharing function will be described with reference to FIG. Here, sharing of an image being displayed (display screen sharing function) provided by the inter-terminal communication system 1 will be described.

  The inter-terminal communication system 1 provides a display screen sharing function. With this display screen sharing function, an image P1 displayed on the display unit 100 of the terminal device 10 is displayed as an image P2 on the display unit 100 of another terminal device 10, whereby an image is displayed between the terminal devices 10. It is a function to share. An example of a screen displayed on the terminal device 10 by this display screen sharing function is shown in FIG. The image displayed on the display unit 100 here includes the above-described standby image, application image, and menu image.

  When the display screen sharing function is selected in a certain terminal device 10A, the inter-terminal communication system 1 displays the image P1 displayed on the display unit 100 of the terminal device 10A as another sharing destination terminal device 10B. Are displayed as an image P2.

  A specific example of this display screen sharing function will be described. For example, a case will be described in which a photo album application is activated in the terminal device 10A, and the photo album application displays a photo image (image P1 shown in FIG. 2A) on the display unit 100. In this case, the inter-terminal communication system 1 displays the image P1 of the photograph displayed on the display unit 100 of the terminal device 10A as the image P2 on the display unit 100 of the other terminal device 10B that is the sharing destination. In this way, the image P1 of the same photograph is displayed on the respective display units 100 of the two terminal devices 10, whereby the photograph image P1 is shared.

  Next, another specific example of the display screen sharing function will be described. For example, a case where a moving image application is activated in the terminal device 10A and the moving image application displays a moving image with sound on the display unit 100 will be described. In this case, the inter-terminal communication system 1 displays the moving image displayed on the display unit 100 of the terminal device 10A on the display unit 100 of the other terminal device 10B that is the sharing destination. Simultaneously with image sharing, the inter-terminal communication system 1 causes the sound reproduced from the sound reproducing unit 130 of the terminal device 10A to be reproduced from the sound reproducing unit 130 of the other terminal device 10B that is the sharing destination. In this way, a moving image with sound is shared between the two terminal devices 10.

  Next, the display of the terminal device 10 at the time of providing the tripartite information sharing function will be described. In FIG. 2B, the display screen is shared by three terminal devices 10A to 10C. In the description of this example, a session is established in advance between the terminal device 10A and the terminal device 10B. In this session, the terminal device 10A used by the user A is the terminal device 10-S on the information transmission side. Further, the terminal device 10B used by the user B is the terminal device 10-R on the information receiving side. And in description of this example, 10 A of terminal devices invite the terminal device 10C to information sharing communication. When information sharing communication by the terminal devices 10A to 10C is started by this invitation, the terminal device 10C functions as the terminal device 10-R on the information receiving side. In an example of information sharing by the three terminal devices 10A to 10C, the shared image P31 displayed by the terminal device 10A, the shared image P32 displayed by the terminal device 10B, and the shared image P33 displayed by the terminal device 10C are: It is the same image. At this time, two shared menu button images PMB and PMB2 are displayed on each display unit 100 of the terminal devices 10A to 10C.

  The share menu button images PMB and PMB2 are images that accept operations for selecting information sharing functions respectively corresponding to two communication partners. Specifically, for example, in the terminal device 10A, the shared menu button image PMB is an image that receives an operation of selecting a menu related to communication with the terminal device 10B. Further, for example, in the terminal device 10A, the shared menu button image PMB2 is an image that receives an operation for selecting a menu related to communication with the terminal device 10C. In the terminal device 10B, the shared menu button images PMB and PMB2 are images that accept operations for selecting menus related to communication with the terminal devices 10A and 10C, respectively. In the terminal device 10C, the shared menu button images PMB and PMB2 are images that accept operations for selecting menus related to communication with the terminal devices 10A and 10B, respectively. Here, the menu related to communication includes, for example, a function of canceling the information sharing function with the terminal device 10 of the communication partner and making only voice communication, and a function of disconnecting both information sharing and voice communication. It is.

  As described above, when the terminal device 10 provides the three-way information sharing function, the display unit 100 displays an image for accepting an operation for selecting a menu related to communication with each of a plurality of communication partners. Thereby, even if it is a case where the user is utilizing the tripartite information sharing function, it can control whether information sharing may be performed for each communication partner individually.

  Note that the shared menu button images PMB and PMB2 may indicate a communication partner to which each image corresponds by an image such as an address book or SNS (Social Networking Service), text, or the like. Specifically, in the terminal device 10A, the shared menu button image PMB may include a photograph of the user B, a name, and the like. Further, in the terminal device 10A, the shared menu button image PMB2 may include a photograph or a name of the user C.

[Overview of selecting information sharing function]
Next, an outline of an operation for the user to activate the information sharing function will be described with reference to FIG. Here, for the sake of brevity, a selection operation when the two-party information sharing function is activated by the two terminal devices 10 will be described.
FIG. 3 is a schematic diagram illustrating a first example of an information sharing function selection operation provided by the inter-terminal communication system 1 of the present embodiment.
Here, a case where user A (Mr. A) and user B (Mr. B) use display screen sharing using the terminal device 10 will be described as an example. In the description of this example, the terminal device 10A used by the user A is the requesting terminal device 10. In the description of this example, the terminal device 10B used by the user B is the requested terminal device 10. Some terminal devices 10 may not support the display screen sharing function. In the description of this example, a case where each terminal device 10 is compatible with the display screen sharing function will be described.

  The user A and the user B use the display screen sharing function by sequentially performing the operations shown in FIGS. 3 (A) to 3 (E). The user A and the user B are making a voice call via the LTE communication network. FIG. 3A shows an example of an image displayed on each terminal device 10 when the user A and the user B are making a voice call via the LTE communication network.

  At this time, the shared menu button image PMB is displayed on both the display unit 100 of the terminal device 10A of the user A and the display unit 100 of the user B. The display of the image PMB of the sharing menu button indicates that the terminal device 10 on the communication partner side supports one of the information sharing functions described above. In this example, the display of the image PMB of the sharing menu button indicates that both the terminal device 10A and the terminal device 10B are compatible with the display screen sharing function.

  User A taps the image PMB of the shared menu button displayed on the display unit 100 of the terminal device 10A. When the operation detection unit 110 of the terminal device 10A detects this tap operation, a launcher image P20 is displayed (see FIG. 3B). The launcher image P20 is an example of the menu image described above. In this example, the launcher image P20 shows icon images of a display screen sharing function, a handwriting sharing function, a position information sharing function, and a camera sharing function. When the user taps the position on the display unit 100 where the icon image is displayed, the function associated with the icon image is activated. Here, a case where the user A taps the icon image P21 of the display screen sharing function among the information sharing functions displayed on the launcher image P20 will be described.

  When the operation detection unit 110 of the terminal device 10A detects this tap operation, a function explanation image P22 of the display screen sharing function is displayed (see FIG. 3C). When the operation detection unit 110 of the terminal device 10A detects this tap operation, a screen sharing start consent image P23 is displayed on the display unit 100 of the sharing destination terminal device 10B. The consent image P23 is an image displayed on the requesting terminal device 10 for information sharing, and prompts the user to perform an operation indicating whether or not to accept the information sharing request by the requesting terminal device 10. It is an image. In this example, the consent image P23 is an image prompting the user B to perform a tap operation indicating whether or not to accept the screen sharing request from the user A.

  Next, the user B taps the image P24 of the consent button of the consent image P23. When the operation detection unit 110 of the terminal device 10B detects this tap operation, an image P25 indicating that it is connected is displayed on each display unit 100 of the terminal device 10B and the terminal device 10A (see FIG. 3D). At this time, an inter-terminal communication session for sharing the display screen is established between the terminal device 10A and the terminal device 10B.

  Next, when a communication session between terminals for display screen sharing is established between the terminal device 10A and the terminal device 10B, an image P26 displayed on the display unit 100 of the terminal device 10A is displayed on the terminal device 10A. It is displayed on the display unit 100 as an image P27 (see FIG. 3E). That is, display screen sharing is started between the terminal device 10A and the terminal device 10B.

Note that each of the terminal devices 10 of the terminal device 10-1S and the terminal device 10-2R holds a telephone number and an IP address of a call partner in which a voice call session is established, as will be described later. During a voice call, both terminal apparatuses 10 check whether the voice call is continued by checking information included in the voice data with the stored telephone number and IP address.
When the call end operation is accepted by either the terminal device 10-1S or the terminal device 10-2R, the terminal device 10 that has accepted the call end operation terminates the voice call session and also displays the display screen. Information communication session (also referred to as an information sharing session between terminals) is also terminated. At this time, the terminal device 10 transmits a session end request to the server device in the LTE communication network in which the voice call session is established, and transmits an information communication session end request to the signaling server 20. When the other terminal device 10 detects that the voice data including the held telephone number and IP address has not been received for a predetermined time, it determines that the voice call is not continued. Thereby, the other terminal device 10 determines that the voice communication session and the information communication session for sharing the display screen are ended.

[Configuration of inter-terminal communication system]
Next, the configuration of the inter-terminal communication system 1 that provides the above-described information sharing function will be described with reference to FIG.
FIG. 4 is a schematic diagram illustrating an example of the configuration of the inter-terminal communication system 1 of the present embodiment. The inter-terminal communication system 1 includes the following devices in addition to the plurality of terminal devices 10 (in this example, the terminal device 10-S and the terminal device 10-R). That is, the inter-terminal communication system 1 includes a signaling server 20, an authentication server 30, a push server 40, and a relay server 50.

  The signaling server 20 manages a session of information sharing communication performed between the terminal devices 10. Specifically, the signaling server 20 can communicate with a plurality of terminal devices 10, the authentication server 30, and the push server 40. When the terminal device 10 supports the information sharing function, the signaling server 20 performs registration (initial registration) of information of the terminal device 10. Further, when there is a request for information sharing from the terminal device 10, the signaling server 20 performs signaling processing for establishing a communication session with the sharing destination terminal device 10. In addition, when there is a request for information sharing from the terminal device 10, the signaling server 20 returns a response as to whether or not the terminal device 10 that is the sharing request destination is compatible with the information sharing function. To do.

The signaling server 20 includes a terminal information reception unit, a suitability determination unit, a determination result transmission unit, and a session construction unit as functional units.
Among these, the terminal information receiving unit receives terminal information from the terminal device 10. The terminal information includes terminal identification information for identifying the terminal device 10 and application identification information for identifying an application operating on the terminal device 10.
The suitability determination unit determines suitability between a first application that operates on a certain terminal device 10 and a second application that operates on another terminal device 10 based on the terminal information.
The determination result transmission unit transmits a determination result by the suitability determination unit to the first application in response to a determination request transmitted by a first application that operates in a certain terminal device 10.
The session construction unit constructs a session between the first application that transmitted the communication start request and the second application in response to the communication start request transmitted by the first application based on the terminal information. In the present embodiment, the session is constructed only between the terminal devices 10 performing voice communication. Then, when ending the voice communication, the session is disconnected. Therefore, information sharing via a session is performed only during voice communication.

  Further, the signaling server 20 determines whether or not the terminal device 10 is a legitimate device at the start of session construction. Whether or not the terminal device 10 is a legitimate device can be determined by various means. In this example, the signaling server 20 determines whether or not the terminal device 10 is a regular device based on the telephone number and the IP address transmitted from the terminal device 10. More specifically, the signaling server 20 is based on whether or not the telephone number and IP address transmitted from the terminal apparatus 10 match the telephone number and IP address previously assigned to the terminal apparatus 10. Then, it is determined whether or not the terminal device 10 is a regular device. In the following description, the determination performed by the signaling server 20 as to whether or not the terminal device 10 is a regular device is also referred to as secure determination.

  In addition, the signaling server 20 stores registration information. The signaling server 20 uses this registration information to perform session construction and secure determination. Registration information stored in the signaling server 20 will be described with reference to FIG.

  FIG. 5 is a table showing an example of registration information stored in the signaling server 20 of the present embodiment. The signaling server 20 stores the telephone number of the terminal device 10, the terminal model name, the push ID, and the application version as registration information. Here, the push ID is identification information for identifying an application for the information sharing function that operates on the terminal device 10.

  Returning to FIG. 4, after the session is established, the signaling server 20 determines whether or not the terminal device 10 is a regular device at a predetermined frequency. The signaling server 20 establishes a session or maintains an established session only when it is determined that the terminal device 10 is a legitimate device. Specifically, when the signaling server 20 determines that the terminal device 10 is a legitimate device, the signaling server 20 issues a token to the terminal device 10. This token is permission information for the terminal devices 10 to communicate with each other via a high-speed communication line. This token has an expiration date from the time of issue. The terminal device 10 can share screen information with other terminal devices 10 when this valid token is issued. Further, the terminal device 1 cannot share screen information with other terminal devices 10 when a token has not been issued and when the validity period of the issued token has expired. In this way, the signaling server 20 manages a session between the terminal devices 10.

  The authentication server 30 stores the telephone number of the terminal device 10 and the Internet protocol address (IP address) in association with each other. When there is a request for an IP address corresponding to the telephone number from the signaling server 20, the authentication server 30 returns an IP address corresponding to the telephone number of the terminal device 10 to the signaling server 20.

  If the combination of the telephone number and the IP address for a certain terminal device 10 does not match the combination of the telephone number and the IP address stored in the authentication server 30, this terminal device 10 is not a legitimate device. there is a possibility. The signaling server 20 acquires a telephone number and an IP address from a certain terminal device 10, and compares the telephone number and the IP address stored in the authentication server to see if the combination of the telephone number and the IP address matches. Determine. As a result of this comparison, when it is determined that the combination of the telephone number and the IP address matches, the signaling server 20 issues a token to the terminal device 10. Further, as a result of this comparison, when it is determined that the combination of the telephone number and the IP address does not match, the signaling server 20 does not issue a token to the terminal device 10.

  The push server 40 stores a plurality of push IDs. The push ID stored in the push server 40 is associated with the application operating on the terminal device 10 by the signaling server 20. Specifically, when a new downloaded application is activated for the first time in the terminal device 10, the terminal device 10 requests the push server 40 to issue a push ID. The push server 40 issues a push ID for the new application of the terminal device 10 based on this request, and transmits the issued push ID to the terminal device 10. The terminal device 10 transmits information associating the new application and the issued push ID as registration information to the signaling server 20. The signaling server 20 stores the registration information transmitted from the terminal device 10. Thereby, the push ID stored in the push server 40 and the application operating on the terminal device 10 are associated by the signaling server 20.

  Further, when the application is upgraded in the terminal device 10, the push server 40 issues a new push ID along with the upgrade. That is, the push server 40 is updated with the update of the application version of the application running on the terminal device 10.

Further, when the signaling server 20 requests the requesting terminal device 10 to start the session construction, the push server 40 uses the push technology to obtain the telephone number of the requesting terminal device 10 by the push technique. 10 is transmitted. This push technology is a technology for delivering a communication request to the terminal device 10 from the server device side (in this example, the signaling server 20 and the push server 40 side) using an IP address. In the following description, transmitting information by the push technique is also referred to as simply pushing information.
Further, when the signaling server 20 invites the requesting terminal device 10 to enter the room, the push server 40 receives the telephone number, the room ID, and the entry key of the requesting terminal device 10. Transmission is made to the requested terminal device 10 by the push technique. The room, room ID, and entry key will be described later.

  In the information sharing communication between the plurality of terminal devices 10, the relay server 50 performs information sharing communication by three or more terminal devices 10 or when the two terminal devices 10 cannot perform peer-to-peer connection. A relay server that relays information sharing communication among a plurality of terminal devices 10. A peer-to-peer connection is also referred to as a P2P connection. When a P2P connection for information sharing communication is performed between a plurality of terminal devices 10 and a terminal device 10 not participating in the P2P connection is newly added to the information sharing communication, a session via the relay server 50 is performed. Built. When a P2P session of information sharing communication between a plurality of terminal devices 10 cannot be established even after a predetermined time, a session via the relay server 50 is established.

  The relay server 50 creates a room in response to a request from the terminal device 10 and relays information sharing communication between a plurality of terminal devices 10 that have entered the same room. This room is a virtual space provided by the relay server 50 so that a plurality of terminal devices 10 can share information. This room is distinguished by, for example, room 1, room 2,. The number assigned to this room is also referred to as a room ID. The terminal device 10 is connected to one of the rooms. Terminal devices 10 connected to rooms with the same room ID can share information with each other. For example, when two terminal devices 10A and 10B are connected to the room 1, the two terminal devices 10A and 10B can share information with each other. Further, for example, when three terminal devices 10A to 10C are connected to the room 1, the three terminal devices 10A to 10C can share information with each other.

  The relay server 50 stores the room ID and the entry key in association with each other. The room ID is identification information for identifying a room. The room entry key is information issued in response to a room creation request received from the terminal device 10 via the signaling server 20 and inquired when entering the room. When the relay server 50 receives a room entry request from the terminal device 10, the room ID in which the combination of the room ID and the room entry key transmitted by the terminal device 10 that has requested the room entry request is stored in the own device. It is determined whether or not the combination with the entry key matches. If the combination of the room ID and the entry key matches, the relay server 50 causes the terminal device 10 to enter the room.

[Operation procedure of inter-terminal communication system]
Next, the operation procedure of the inter-terminal communication system 1 will be described with reference to FIGS. First, an operation procedure of registration (initial setting) of the terminal device 10 will be described with reference to FIG. Next, with reference to FIGS. 7-9, the operation | movement procedure of the session construction by the communication system 1 between terminals is demonstrated. In the inter-terminal communication system 1 according to the present embodiment, the terminal devices 10 can communicate with each other in two communication modes, that is, a relay mode and a P2P mode. Here, the relay mode is a communication mode via the relay server 50. The P2P mode is a communication mode in which the terminal devices 10 communicate directly with each other without using the relay server 50, and is a mode in which communication is performed by P2P connection. In the following, first, the construction of a session in the P2P mode will be described. Then, the construction of a session in the relay mode will be described. Note that the numbers in step S shown in FIG. 4 correspond to the numbers in step S in FIGS. 6 and 7.

[Operation procedure of inter-terminal communication system 1: initial setting]
With reference to FIG. 6, an operation procedure of registration (initial setting) of the terminal device 10 will be described. Here, a case where the terminal device 10A and the terminal device 1010B perform registration in order will be described.

FIG. 6 is a flowchart illustrating an example of an operation procedure of registration according to the present embodiment.
When the application corresponding to the information sharing function is activated in the terminal device 10A, the terminal device 10A transmits a push ID issuance request corresponding to the activated application to the push server 40 (step S10).
Upon receiving the push ID issuance request, the push server 40 transmits a push ID corresponding to the activated application to the terminal device 10A (step S20). The terminal device 10A acquires the push ID from the push server 40 (step S30).

  Next, the terminal device 10 transmits registration information to the signaling server 20 (step S40). Here, the registration information includes the push ID acquired in step S10, the application version information of the application corresponding to the push ID, the phone number of the own device, and the terminal model name of the own device.

  The signaling server 20 stores the registration information transmitted in step S40 (step S50), and ends the registration process for the terminal device 10A.

  Next, the signaling server 20 transmits a telephone number to the authentication server 30 (step S60). This telephone number is a telephone number included in the registration information transmitted in step S40.

  The authentication server 30 receives the telephone number transmitted in step S60, determines whether this telephone number is a telephone number registered in advance, and transmits this determination result to the signaling server 20 (step). S70). Here, the telephone number registered in advance in the authentication server 30 is information indicating that the terminal device 10 is a legitimate terminal device 10. That is, the authentication server 30 determines whether or not the telephone number included in the registration information transmitted from the terminal device 10 is the regular telephone number of the terminal device 10. Moreover, the regular terminal device 10 here is the terminal device 10 used by a regular user registered in advance. That is, the signaling server 20 determines whether or not the terminal device 10 that has transmitted the registration information is a terminal device 10 that is used by a registered regular user. That is, the signaling server 20 authenticates the user of the terminal device 10 in step S60 and step S70.

  Further, the terminal device 10B performs registration through steps S10-2 to S70-2 shown in FIG. Here, Steps S10-2 to S70-2 correspond to Steps S10 to S70 described above. A description of steps S10-2 to S70-2 will be omitted.

[Operation of inter-terminal communication system 2: session construction (P2P mode)]
Next, with reference to FIG. 7 to FIG. 9, an operation procedure for session construction of the terminal device 10 will be described.

  FIG. 7 is a flowchart illustrating an example of an operation procedure for session construction in the P2P mode according to the present embodiment. Here, a case where a session is constructed between the terminal device 10A and the terminal device 10B will be described. In addition, here, the inter-terminal communication system 1 will be described with respect to two processes: a process for determining whether the information sharing function can be used, and a session construction process in the P2P mode. The process of determining whether or not the information sharing function can be used is executed by the processes of steps S100 to S130. Moreover, the session construction process by P2P mode is performed by the process of step S140-S200. Here, a case will be described in which the terminal device 10A is the information sharing requesting side and the terminal device 10B is the information sharing requested side.

The requesting terminal device 10A transmits an information sharing request to the signaling server 20 (step S100).
The signaling server 20 receives an information sharing request from the terminal device 10 (step S110). This request for information sharing includes the telephone number of the requested terminal device 10.

Next, the signaling server 20 compares the telephone number received in step S110 with the registration information stored in advance, and determines whether or not the received telephone number is available (step S120). .
The signaling server 20 can also determine the push ID instead of or in addition to the determination of the telephone number. Specifically, the signaling server 20 determines whether or not the push ID is registered in the registration information corresponding to the telephone number received in step S110.

  Next, when the signaling server 20 determines that the telephone number received in step S110 is available (step S120; YES), the information sharing function can be used for the requesting terminal device 10. A notification is made (step S130). On the other hand, if the signaling server 20 determines that the telephone number received in step S110 is not usable (step S120; NO), the information sharing function cannot be used for the requesting terminal device 10. This is notified and the process is terminated.

  In the above description, the signaling server 20 indicates that the information sharing function can be used for the requesting terminal device 10 in the process of establishing a session after the signaling server 20 requests information sharing. Although described as notification, it is not limited to this. As an example, the signaling server 20 may notify the requesting terminal device 10 that the information sharing function is available before the information sharing request is made. In this case, the signaling server 20 sends a request to the requesting terminal device 10 before the information sharing request is made by the background processing of the voice call at the start of the voice call between the terminal devices 10 or during the voice call. That the information sharing function is available.

  As another modification, the signaling server 20 may notify that the information sharing function can be used according to the conditions exemplified below instead of or in addition to the determination of the telephone number. Good. As an example, the signaling server 20 indicates that the information sharing function can be used when the information sharing application is installed in both the requesting terminal device 10 and the requested terminal device 10. Notice. As an example, in the signaling server 20, the application version of the information sharing application installed in the requesting terminal device 10 and the application version of the information sharing application installed in the requested terminal device 10 are the same. If it is, it is notified that the information sharing function is available. Further, as an example, the signaling server 20 is compatible with the information sharing application installed in the requesting terminal device 10 and the information sharing application installed in the requested terminal device 10. Notify that the information sharing function is available.

  As another example, the signaling server 20 is a terminal device in which both the requesting terminal device 10 and the requested terminal device 10 support communication via a high-speed data communication line (for example, VoLTE). In such a case, a notification that the information sharing function is available is sent.

Next, when receiving the notification that the information sharing function is available, the requesting terminal device 10 transmits a session construction request to the signaling server 20 (step S140). This request for session construction includes the telephone number and IP address of the terminal device 10 on the transmission request side and the telephone number of the terminal device 10 on the request side.
Note that there is no limitation on the order of processing timing between step S100 and step S140 described above. For example, step S100 may be performed first, step S140 may be performed later, and step S100 and step S140 may be performed simultaneously.

  Next, when the signaling server 20 receives the session construction request transmitted in step S140, the signaling server 20 transmits the session construction information to the push server 40 (step S150). This session construction information includes the telephone number of the requesting terminal device 10 and the push ID. At this time, the signaling server 20 acquires the push ID by searching the registration information using the telephone number of the requested terminal device 10 as a search key. This push ID corresponds to an information sharing application that operates in the requested terminal device 10.

  Upon receiving the session construction information transmitted in step S150, the push server 40 pushes an information sharing application activation request to the requested terminal device 10 based on the push ID included in the session construction information. (Step S160). The information pushed by the push server 40 at this time includes the telephone number of the requesting terminal device 10.

  When the requested terminal device 10 is pushed in step S160, it determines whether the received telephone number of the requesting terminal device 10 matches the telephone number of the other party who is currently talking (step S160). S170). If the requested terminal device 10 determines that the received telephone number of the requesting terminal device 10 matches the telephone number of the other party who is currently talking (step S170; YES), the process proceeds to step S180. Proceed. On the other hand, if the requested terminal device 10 determines that the received telephone number of the requesting terminal device 10 does not match the telephone number of the other party who is currently calling (step S170; NO), information sharing is performed. Is transmitted to the requesting terminal device 10 via the signaling server 20 and the processing is terminated.

  In step S180, the requested terminal device 10 displays an information sharing approval image and waits for the user's approval operation. The requested terminal device 10 transmits the session construction approval information to the signaling server 20 when the user performs an operation to approve (step S180; YES) (step S190). The session construction approval information includes the telephone number, IP address, and port number of the requested terminal device 10. On the other hand, if the requested terminal device 10 performs an operation not approved by the user (step S180; NO), the requesting terminal device 10 notifies the requesting terminal device 10 via the signaling server 20 that the information sharing is not approved. To finish the process.

  Next, upon receiving the session construction approval information transmitted in step S190, the signaling server 20 constructs a session between the requesting terminal device 10 and the requested terminal device 10 (step S200). The session construction process is terminated. Specifically, in step S200, the signaling server 20 transmits the IP address and port number of the requested terminal device 10 transmitted in step S190 to the requesting terminal device 10. Next, the requesting terminal device 10 transmits the IP address and port number of the requesting terminal device 10 to the signaling server 20. When the signaling server 20 receives the IP address and port number of the requesting terminal device 10, the signaling server 20 transmits the received IP address and port number to the requesting terminal device 10. As a result, the requesting terminal device 10 acquires the IP address and port number of the requested terminal device 10. Further, the requested terminal device 10 acquires the IP address and port number of the requesting terminal device 10. That is, the plurality of terminal devices 10 acquire the IP address and port number of the information sharing partner terminal device 10 from each other.

  When the session construction process ends, the terminal device 10A and the terminal device 10B share information with each other (step S210).

[Operation of communication system between terminals 2: session construction (relay mode)]
Next, the procedure of session construction operation in the relay mode will be described.
8 and 9 are flowcharts showing an example of an operation procedure for session construction in the relay mode of this embodiment. Here, session construction between two terminal devices 10 will be described, but session construction between three or more terminal devices 10 is also possible in the relay mode. Here, a room creation process and a room entry process will be described. The room creation process is executed by the processes of steps S300 to S370. Further, the room entry process of the terminal apparatus 10 that has requested the room creation is executed by the processes of steps S380 to S400. In addition, the room entry process of the terminal device 10 that has received the invitation to enter the room is executed by the processes of steps S410 to S520. In the following, the description of the process for determining whether to use the information sharing function described with reference to FIG. 6 is omitted. This determination process for determining whether or not the information sharing function can be used is executed, for example, before step S300.

  First, the requesting terminal device 10 transmits a room creation request to the signaling server 20 (step S300). This room creation request is information requesting the relay server 50 to create a room. Further, the room creation request includes the telephone number of the requesting terminal device 10. That is, the requesting terminal device 10 transmits a room creation request including the telephone number of the requesting terminal device 10 to the signaling server 20.

  When the signaling server 20 receives the telephone number of the requesting terminal device 10, the signaling server 20 outputs a request for confirming the free capacity of the relay server 50 to the relay server 50 (step S310). When the relay server 50 receives the request for checking the free capacity of the relay server 50, the relay server 50 determines whether or not a new room can be created (step S320), and transmits the determination result to the signaling server 20 (step S330). .

  If the received determination result indicates that a new room can be created (step S320; YES), the signaling server 20 transmits a room creation request to the relay server 50 (step S340). As described above, this room creation request includes the telephone number of the requesting terminal device 10.

  When receiving the room creation request, the relay server 50 issues a new room ID and creates a room with the room ID (step S350). Further, the relay server 50 issues an entry key for entering the created room. The relay server 50 transmits a response to the room creation request to the signaling server 20 (step S360). The response to the room creation request includes the room ID issued by the relay server 50 and the entry key. When the signaling server 20 receives the response to the room creation request, the signaling server 20 transmits information including the room ID and the entry key included in the response to the requesting terminal device 10 as a response to the room creation request (step S370). ).

The requesting terminal device 10 receives a response to the room creation request from the signaling server 20. As described above, the response to the room creation request includes the room ID issued by the relay server 50 and the room entry key.
The requesting terminal device 10 transmits a room entry request to the relay server 50 (step S380). The room entry request includes the room ID received from the signaling server 20 and the room entry key. That is, the request-side terminal device 10 transmits information including the room ID issued by the relay server 50 and the room entry key to the relay server 50 as a room entry request. When the relay server 50 receives the room entry request, the relay server 50 collates the room ID included in the room entry request with the room entry key (step S390). If the combination of the room ID and the room entry key is correct as a result of this collation (step S390; YES), the relay server 50 causes the requesting terminal device 10 to enter the room and notifies that the room has been entered. (Step S400).

The requesting terminal device 10 invites the requested terminal device 10 to enter the room. Specifically, the requesting terminal device 10 transmits a request for invitation to enter the room to the signaling server 20 (step S410). The request to enter the room includes identification information of the requesting terminal device 10, identification information of the requested terminal device 10, a room ID, and an entry key. Here, the identification information of the terminal device 10 is information for identifying the terminal device 10 such as a telephone number or an IP address of the terminal device 10.
When the signaling server 20 receives a request to enter the room from the requesting terminal device 10, the signaling server 20 transmits a push request to the push server 40 (step S420). This push request includes identification information of the requesting terminal device 10, identification information of the requested terminal device 10, a room ID, and an entry key.

  Upon receiving the push request from the signaling server 20, the push server 40 transmits invitation information for entering the room to the requested terminal device 10 (step S430). The invitation information for entering the room includes identification information of the requesting terminal device 10, identification information of the requested terminal device 10, a room ID, and an entry key. Further, when the push server 40 transmits the invitation information for entering the room, the push server 40 transmits a response indicating that the invitation information for entering the room has been transmitted to the signaling server 20 (step S440). When the signaling server 20 receives a response indicating that the invitation information for entering the room has been transmitted, the signaling server 20 transmits a response to the request for invitation to enter the room to the requesting terminal device 10 (step S450). .

  On the other hand, when the requested terminal device 10 receives the invitation information for entering the room from the push server 40, the requested terminal device 10 informs the user of the requested terminal device 10 that the invitation information for entering the room has been received. Notification is made and the operation for entering the room is awaited (step S460). When the user of the requested terminal device 10 performs an operation to enter the room, the requested terminal device 10 accepts this operation, and the requesting terminal device 10 enters the room. Is transmitted (step S470). Upon receiving the request for entering the room from the requested terminal device 10, the requesting terminal device 10 waits for an input operation of a response to the request for entering the room (step S480). When the requesting terminal device 10 receives approval from the user for entry into the room of the requested terminal device 10, the requesting terminal device 10 transmits approval information indicating approval of entry into the room to the requested terminal device 10 ( Step S490). The response to the request to enter the room includes information indicating that the communication mode is the relay mode.

  In this example, when the requested terminal device 10 receives an operation of entering the room by the user, the requested terminal device 10 transmits a request to enter the room to the requesting terminal device 10. Although explained, it is not limited to this. The requested terminal device 10 may transmit a request to enter the room to the requesting terminal device 10 without requiring an operation by the user. In this case, for example, the requested terminal device 10 sets whether or not a user confirmation is required when transmitting a request to enter a room for each communication partner registered in the address book application. Can be remembered. When the requesting terminal device 10 is a terminal device 10 that is set to require no user confirmation, the requested terminal device 10 does not request an operation by the user, A request to enter the room is transmitted to the requesting terminal device 10. Further, for example, if the requested terminal device 10 receives invitation information for entering a room during voice communication, the requesting terminal device 10 does not request an operation by the user by default. A request to enter the room may be transmitted to the terminal device 10. As a result, the requested terminal device 10 automatically requests the requesting terminal device 10 to enter the room without requiring an operation by the user in the reconstruction (reconnection) of the session. Can be sent.

  Upon receiving the approval information for the request to enter the room from the requesting terminal device 10, the requested terminal device 10 transmits a room entry request to the relay server 50 (step S 500). The room entry request includes the room ID received from the push server 40 and the room entry key. Here, the room ID received from the push server 40 matches the room ID of the room in which the requesting terminal device 10 has already entered the room. The room entry key received from the push server 40 matches the room entry key of the room in which the requesting terminal device 10 has already entered the room. That is, the requested terminal device 10 transmits to the relay server 50 an entry request for a room in which the requesting terminal device 10 has already entered. When the relay server 50 receives the room entry request, the relay server 50 collates the room ID included in the room entry request with the room entry key (step S510). As a result of this collation, when the combination of the room ID and the room entry key is correct (step S510; YES), the relay server 50 causes the requested terminal device 10 to enter the room. Then, it notifies all terminal devices 10 connected to the same room that the requested terminal device 10 has entered the room (step S520).

By this procedure, the requesting terminal device 10 and the requested terminal device 10 enter the same room provided by the relay server 50. Thereby, information sharing via the relay server 50 becomes possible between the requesting terminal device 10 and the requested terminal device 10.
In addition, the relay server 50 may notify the other terminal devices 10 connected to the same room to the terminal device 10 connected to the room. This notification may be performed in response to a request from the terminal device 10, or the terminal device 10 connected to the room, such as when the terminal device 10 newly enters the room or when the terminal device 10 leaves the room. This may be done when changes occur.

[Modification: Operation of communication system between terminals (Modification 1): Switching of communication line]
Next, switching of communication lines by the relay server 50 will be described. In the case of the present embodiment, among the information sharing communication among the plurality of terminal devices 10, the P2P session is constructed using an LTE line. In the case of the present embodiment, of the information sharing communication among the plurality of terminal devices 10, a session via the relay server 50 is established using a wireless LAN line.

  Here, a voice call between a plurality of terminal devices 10 is performed using an LTE line, and information sharing communication is performed by switching between a state using an LTE line and a state using a wireless LAN line. There is. In this case, since the IP address of the terminal device 10 used for information sharing communication changes due to line switching, the inter-terminal communication system 1 reestablishes the session. While re-establishing this session, the terminal device 10 on the transmission side temporarily stores the communication state before switching the line, and after re-establishing the session, based on the stored communication state, Restore information sharing.

In addition, when communication is performed using a LTE line between a plurality of terminal apparatuses 10 that support the information sharing function, the inter-terminal communication system 1 can be controlled as follows. In addition, the case where it communicates on the LTE line between the some terminal devices 10 corresponding to the information sharing function here is a case where information sharing communication is performed in the some terminal devices 10, or information sharing This includes the case where a voice call is made between a plurality of terminal devices 10 that implement an application corresponding to the function.
In this case, when the communication line between the plurality of terminal apparatuses 10 can select an LTE line and a communication line other than the LTE line, the inter-terminal communication system 1 uses the communication line between the plurality of terminal apparatuses 10 as an LTE line. And control not to switch to a communication line other than the LTE line.

  In addition, for information sharing communication between a plurality of terminal apparatuses 10, there is a case where a state where an LTE line is used and a state where a wireless LAN line is used are switched, or a session once disconnected is reestablished. In this case, the inter-terminal communication system 1 establishes a session by omitting the consent procedure by the requested terminal device 10 (or the requesting terminal device 10). In this case, the inter-terminal communication system 1 selects whether to omit the acceptance procedure based on the time from when the session is switched or disconnected until the session is reestablished. For example, the inter-terminal communication system 1 omits the acceptance procedure if the time from when the session is switched or disconnected to when the session is reestablished is equal to or shorter than a predetermined timeout time. Further, the inter-terminal communication system 1 does not omit the acceptance procedure if the time from when the session is switched or disconnected to when the session is reestablished is longer than a predetermined timeout time. That is, the inter-terminal communication system 1 omits the acceptance procedure when the session once established is switched or disconnected, or when the session is switched or disconnected for a relatively short time. Thereby, the communication system 1 between terminals can reduce a user's effort when the session is switched or disconnected.

Here, a specific example of communication line switching by the relay server 50 will be described.
When the establishment of the P2P session fails, the relay server 50 switches the communication mode from the P2P mode to the relay mode.
First, for example, when the session establishment fails, the terminal device 10 transmits error information to the signaling server 20. The error information is information indicating that the session has not been established within a predetermined time. That is, the error information is information indicating that communication for information sharing between the terminal devices 10 is not possible. Here, the predetermined time is a timeout time measured when a connection request for establishing a session is transmitted from the requesting terminal device 10 to the requested terminal device 10, and is, for example, 2 seconds. The error information can be transmitted by both the requesting terminal device 10 and the requested terminal device 10. That is, the signaling server 20 receives the error information from one or both of the requesting terminal device 10 and the requested terminal device 10. When receiving the error information from the requesting terminal device 10, the signaling server 20 executes the procedure for switching the communication line described with reference to FIGS. 8 and 9 with the relay server 50.

[Modification: Operation of communication system between terminals (Modification 2): Periodic authentication operation]
After the session is established, the signaling server 20 determines whether or not the terminal device 10 is a regular device at a predetermined frequency. That is, the signaling server 20 periodically performs an operation of authenticating whether or not the terminal device 10 is a regular device at a predetermined frequency. This predetermined frequency is, for example, every few seconds. The regular terminal device 10 here is a device in which a combination of a telephone number and an IP address matches a combination of a telephone number and an IP address registered in the authentication server 30 in advance.
Thereby, the inter-terminal communication system 1 can exclude the use of the information sharing function by the unauthorized terminal device 10.

[Variation: Variation of session construction procedure]
Next, a modified example of the session construction procedure of the inter-terminal communication system 1 will be described. Here, a case where registration of the terminal apparatus 10 has already been completed will be described. In addition, here, a description will be given while comparing with steps S100 to S210 in the session construction procedure shown in FIG. For this reason, illustration of step S600 to step S670 about the procedure of the modified example of the session construction procedure is omitted.

  The signaling server 20 receives a request for information sharing from the requesting terminal device 10 (step S600). This step S600 corresponds to the above-described steps S100 to S110. This information sharing request includes the telephone number of the requesting terminal device 10 and the telephone number of the requested terminal device 10. That is, this modification differs from step S100 described above in that the request for information sharing includes the telephone number of the requesting terminal device 10.

  Next, the signaling server 20 compares the telephone number received in step S600 with the registration information stored in advance, and determines whether or not the received telephone number is available (step S610). . This step S610 corresponds to step S12 described above. Here, the signaling server 20 determines whether or not the telephone number of the requesting terminal device 10 and the telephone number of the requested terminal device 10 are available. In other words, the present modification is different from step S120 described above in that the phone number of the requesting terminal device 10 is included in the determination target whether or not it can be used.

  Next, when the signaling server 20 determines that the telephone number received in step S610 is available (step S610; YES), the signaling server 20 assigns the requested side IP address to the requesting terminal device 10. Transmit (step S620). In this case (step S610; YES), the signaling server 20 transmits session construction information to the push server 40 (step S630). This step S630 corresponds to the above-described steps S130 to S150. This session construction information includes the IP address of the requesting terminal device 10 and the push ID corresponding to the information sharing application running on the terminal device 10. That is, the present modification is different from Steps S130 to S150 described above in that the procedure for transmitting the request for session establishment by the requesting terminal device 10 is omitted.

  When the push server 40 receives the session construction information transmitted in step S630, the push server 40 sends the IP of the requesting terminal device 10 to the requested terminal device 10 based on the push ID included in the session construction information. The address is pushed (step S640). This step S640 corresponds to the above-described step S160. That is, the present modification is different from step S160 described above in that the push server 40 pushes the IP address instead of the telephone number of the requesting terminal device 10.

  When the requested terminal device 10 is pushed in step S640, it displays an information sharing approval image and waits for the user's approval operation (step S650). This step S650 corresponds to the above-described steps S170 to S180. That is, the modification is different from step S170 described above in that the telephone number match determination is omitted in the requested terminal device 10.

  The requested terminal device 10 transmits the session construction approval information to the signaling server 20 when the user performs an operation to approve (step S650; YES) (step S660). This step S660 corresponds to the above-described step S190. On the other hand, if the requested terminal device 10 performs an operation that the user does not approve (step S650; NO), the requesting terminal device 10 notifies the requesting terminal device 10 via the signaling server 20 that the information sharing is not approved. To finish the process.

  Next, when the signaling server 20 receives the session construction approval information transmitted in step S660, the signaling server 20 constructs a session between the requesting terminal device 10 and the requested terminal device 10 (step S670). The session construction process is terminated. This step S670 corresponds to step S200 described above. That is, according to the session construction procedure of this modification, a session can be constructed by a simpler procedure as compared with the procedure from step S100 to step S200 described above.

[Basic operation when starting three-way information sharing communication]
Next, provision of a three-way information sharing function by the inter-terminal communication system 1 will be described with reference to FIGS. The inter-terminal communication system 1 of the present embodiment provides information sharing communication only when voice communication is performed. In the following, from the state in which voice communication and information sharing communication in the P2P mode are performed between the first terminal device 10 and the second terminal device 10, the three parties including the third terminal device 10 are included. Processing until inter-information sharing communication is performed will be described.

First, the start of the three-way information sharing communication in the relay mode will be described.
10 and 11 are schematic diagrams showing an outline of providing a three-way information sharing function by the inter-terminal communication system 1 of the present embodiment. FIG. 10 is a schematic diagram showing an outline of a flow of processing for switching the two-party information sharing communication from the P2P mode to the relay mode in order to provide the three-party information sharing function. FIG. 11 is a schematic diagram showing an outline of a processing flow until the three-way information sharing function including the third terminal device 10 is provided after the transition to the relay mode.

  In this example, the terminal devices 10A to 10C in FIGS. 10 and 11 are the same as the terminal devices 10A to 10C in FIG. First, the terminal device 10A and the terminal device 10B perform voice communication and share information in the P2P mode (step S700). Next, a request for voice communication is made from the terminal device 10C to the terminal device 10A (step S710), and when the user of the terminal device 10A selects the start of voice communication including the terminal device 10C, the terminal devices 10A to 10C Then, the three-party voice communication (three-party call) for transmitting and receiving voice data to each other is started (step S720). Next, the terminal device 10A switches the communication mode with the terminal device 10B from the P2P mode to the relay mode.

  Specifically, as described above, first, the terminal device 10A transmits a room creation request to the relay server 50 via the signaling server 20 (steps S730 and S740). At this time, the terminal apparatus 10A includes the telephone number of the terminal apparatus 10B in addition to the telephone number of the own apparatus in the room creation request. Next, the relay server 50 transmits the room ID and entry key of the room created in response to the room creation request to the terminal devices 10A and 10B (step S750). That is, the signaling server 20 specifies the room ID of the room where the terminal device 10A and the terminal device 10B enter. Then, the terminal devices 10A and 10B enter the same room using the room ID and the entry key acquired from the relay server 50, and the terminal devices 10A and 10B start information sharing communication in the relay mode (step S760). .

  Next, when the user of the terminal device 10A selects the start of information sharing communication including the terminal device 10C, the terminal device 10A invites the terminal device 10C to share information. Specifically, the terminal device 10A notifies the terminal device 10C of the room ID and the room entry key of the room where the device itself enters (step S770). Next, when the user of the terminal device 10C who has received the invitation accepts the sharing of information, the terminal device 10C accesses the relay server 50 and enters the room to which the terminal devices 10A and 10B are connected. The terminal device 10C accesses the relay server 50 and enters the room to which the terminal devices 10A and 10B are connected using the room ID and the entry key notified from the terminal device 10A. Then, the terminal device 10C starts information sharing communication in the relay mode with the terminal devices 10A and 10B (step S780). Thereby, the terminal devices 10 </ b> A to 10 </ b> C can share information with each other via the relay server 50.

  Note that the terminal device 10 </ b> A may check whether the terminal device 10 </ b> C supports the information sharing function in the background when performing a three-party call. In this case, the terminal device 10A transmits the telephone number of the terminal device 10C to the signaling server 20 in the background. Then, the terminal device 10A receives a response from the signaling server 20 as to whether or not the terminal device 10C is compatible with the information sharing function.

[Modification: Operation at the time of starting three-way information sharing communication (Modification 1)]
Next, a first modification of the operation of the inter-terminal communication system 1 at the start of the three-party information sharing communication will be described with reference to FIG. In the first modified example, a certain terminal device 10 performing information sharing communication with a plurality of terminal devices 10 notifies the other terminal device 10 of the IP address of one terminal device 10 among a plurality of communication partners. To do. Thereby, a plurality of terminal devices 10 of a communication partner of a certain terminal device 10 can establish a session by exchanging IP addresses with each other.

FIG. 12 is a schematic diagram illustrating an overview of providing a three-party information sharing function by the inter-terminal communication system 1 according to the first modification.
Here, as in the basic operation described above, an example in which three-party information sharing communication is started by three terminal devices 10A to 10C will be described. Here, a case where information is shared in the P2P mode between the terminal device 10A and the terminal device 10B will be described. Here, a case where the terminal devices 10A to 10C are performing a three-party call will be described. The flow of processing from when voice communication and two-party information sharing communication in P2P mode are performed between the terminal device 10A and the terminal device 10B until a three-party call is performed by the terminal devices 10A to 10C. Since it is the same as the processing from step S700 to S720 of the basic operation described above, the description thereof is omitted.

In the first modification example shown in FIG. 12, the inter-terminal communication system 1 uses the IP address of one terminal device 10 of the terminal device 10B and the terminal device 10C with which the terminal device 10A communicates with its own device. The terminal device 10 is notified.
Specifically, first, the terminal device 10A and the terminal device 10B share information in the P2P mode (step S800). In FIG. 12, illustration of the provision of a three-way call is omitted. When the user of the terminal device 10A selects the start of information sharing communication including the terminal device 10C, the terminal device 10A invites the terminal device 10C to share information (step S810). When the user of the terminal device 10C consents to information sharing with the terminal devices 10A and 10B, the terminal device 10C notifies the terminal device 10A that the provision of the three-way information sharing communication has been accepted (step S820). ). The terminal device 10A and the terminal device 10C start communication in the P2P mode (step S830).

  On the other hand, the terminal device 10A transmits an information sharing consent request including the terminal device 10C to the terminal device 10B (step S840). Then, when the user of the terminal device 10B approves the information sharing communication including the terminal device 10C, the terminal device 10B notifies the terminal device 10A that the provision of the three-way information sharing function has been approved (step). S850).

Next, the terminal device 10A transmits the IP address of the terminal device 10B to the terminal device 10C via the P2P session or the signaling server 20 (step S860). Further, the terminal device 10A transmits the IP address of the terminal device 10C to the terminal device 10B via the P2P connection or the signaling server 20 (step S860). Thereby, the terminal device 10B acquires the IP address of the terminal device 10C. Also, the terminal device 10C acquires the IP address of the terminal device 10B. Then, the terminal device 10B and the terminal device 10C start communication in the P2P mode, for example, based on the acquired IP address (step S870). Accordingly, communication in the P2P mode is performed between the terminal device 10A and the terminal device 10B, between the terminal device 10A and the terminal device 10C, and between the terminal device 10B and the terminal device 10C. Accordingly, the terminal devices 10A to 10C can share information with each other.
Here, the terminal devices 10A to 10C have been described with respect to communication in the P2P mode. However, the terminal devices 10A to 10C may perform communication in the relay mode via the relay server 50.

[Modification: Operation at the time of starting three-way information sharing communication (Modification 2)]
Next, a second modification example of the operation of the inter-terminal communication system 1 at the start of the three-party information sharing communication will be described with reference to FIG. In the second modification, a certain terminal device 10 performs information sharing in a P2P mode with a plurality of terminal devices 10. And this certain terminal device 10 determines whether the information received from one terminal device 10 is transmitted to the other terminal device 10 among several communication partners. Thereby, a certain terminal device 10 can share different information with a plurality of terminal devices 10.

FIG. 13 is a schematic diagram illustrating an overview of providing a three-party information sharing function by the inter-terminal communication system 1 according to the second modification.
Here, as in the basic operation described above, an example in which three-party information sharing communication is started by three terminal devices 10A to 10C will be described. Here, a case where information is shared in the P2P mode between the terminal device 10A and the terminal device 10B will be described. Here, a case where the terminal devices 10A to 10C are performing a three-party call will be described. The flow of processing from the state in which voice communication and two-party information sharing communication in the P2P mode are performed between the terminal device 10A and the terminal device 10B until the three-party call by the terminal devices 10A to 10C is performed Since it is the same as the processing from step S700 to S720 of the basic operation described above, the description thereof is omitted.

  The second modification will be specifically described. First, the terminal device 10A and the terminal device 10B share information in the P2P mode (step S800). In FIG. 13, illustration of the provision of a three-way call is omitted. Next, when the user of the terminal device 10A selects the start of information sharing communication including the terminal device 10C, the terminal device 10A invites the terminal device 10C to share information (step S810). Next, when the user of the terminal device 10C consents to share information with the terminal device 10A, the terminal device 10C is permitted to provide bilateral information sharing communication between the terminal device 10A and the terminal device 10C. To the terminal device 10A (step S820). Then, the terminal device 10A and the terminal device 10C start communication in the P2P mode (step S830).

  At this time, the terminal device 10A and the terminal device 10B share information in the P2P mode. Further, the terminal device 10A and the terminal device 10C share information in the P2P mode. However, the terminal device 10B and the terminal device 10C do not share information. Then, for example, the terminal device 10A can individually manage information shared with the terminal device 10B and information shared with the terminal device 10C. Specifically, the terminal device 10A switches, for example, information displayed on the own device among information shared with the terminal device 10B and information shared with the terminal device 10C according to time. Also, the terminal device 10A displays, for example, information shared with the terminal device 10B and information shared with the terminal device 10C side by side on the display unit 100 of the own device.

  Next, the terminal device 10A determines whether or not to transmit information received from one of the two terminal devices 10B and 10C to the other terminal devices 10B and 10C. Specifically, for example, the terminal device 10A does not transmit, to the terminal device 10C, information shared only with the own device among the information received from the terminal device 10B. Further, for example, the terminal device 10A does not transmit, to the terminal device 10B, information shared only with the own device among the information received from the terminal device 10C.

The determination by the terminal device 10A regarding whether to transmit the information received from the terminal device 10B to the terminal device 10C will be described.
For example, the terminal device 10A inquires whether or not the information to be shared between the own device and the terminal device 10B may be transmitted to the terminal device 10C. When the terminal device 10B receives the inquiry, the terminal device 10B displays on the display unit 100 an image that requests input of whether or not to transmit the information to be shared to the terminal device 10C. Next, the user of the terminal device 10B confirms the displayed image and inputs whether or not the information to be shared can be transmitted to the terminal device 10C. The terminal device 10B generates sharability information indicating an input result received from the user regarding whether or not the information to be shared can be transmitted to the terminal device 10C. The terminal device 10B adds sharability information to the information to be shared transmitted from the own device to the terminal device 10A and transmits the information to the terminal device 10A. The terminal device 10A refers to the sharability information received from the terminal device 10B, and transmits the sharing target information to the terminal device 10C when transmission of the sharing target information to the terminal device 10C is permitted.

  Further, for example, when the terminal device 10A receives the information to be shared between the terminal device 10B and the terminal device 10B, the terminal device 10A inquires whether or not the received information may be transmitted to the terminal device 10C. Then, the terminal device 10B generates sharability information based on the input from the user, and transmits the generated sharability information to the terminal device 10A. The terminal device 10A associates the shareability information received from the terminal device 10B with the information to be shared. Then, based on the sharability information, it is determined whether or not information to be shared is transmitted to the terminal device 10C.

  Here, the terminal devices 10A to 10C have been described with respect to communication in the P2P mode. However, the terminal devices 10A to 10C may perform communication in the relay mode via the relay server 50.

  In addition, the terminal device 10 has been described so far as being the entire area of the display unit 100 in the display screen sharing function, but is not limited thereto. In the display screen sharing function, the terminal device 10 may share an image of a partial area instead of the entire area of the display unit 100. For example, when images of a plurality of applications are displayed on the display unit 100, the terminal device 10 may determine whether to share an image for each application or for each type of application. Further, for example, when an image of an e-mail application is displayed, the terminal device 10 may not share the area of the body of the e-mail.

  Note that the terminal device 10 may store in advance a target application for sharing an image. In this case, the user performs an operation on the terminal device 10 to preselect an application that shares an image and an application that does not share an image, among applications having an information sharing function. The terminal device 10 stores a target application to share an image based on the selected operation. Further, when the information sharing function is activated, the terminal device 10 determines whether or not the application is a target application for sharing an image based on information stored in advance.

  In addition, until now, the terminal device 10 has been described as providing the three-party information sharing function when an interrupt communication request is made while the two-party information sharing function is being provided. Not limited. For example, a requesting terminal device 10 not communicating with another terminal device 10 requests a plurality of requested terminal devices 10 to construct a session, and starts providing a three-way information sharing function. May be.

[Modification: Tablet terminal]
In addition, although the case where the terminal device 10 was a mobile phone, a smart phone, etc. was demonstrated as an example until now, it is not restricted to this. For example, the terminal device 10 may be a device such as a tablet. Here, the mobile phone and the smartphone are provided with an ear-facing call speaker 131, and can be talked to the ear. On the other hand, the tablet does not include the earphone speaker 131. That is, the terminal device 10 may be a device that does not include the earphone call speaker 131. When the terminal device 10 is a tablet, a call may be performed in the speaker mode.

[Variation: Information sharing during text communication]
In the above description, the inter-terminal communication system 1 has been described as providing an information sharing function during a voice call. However, the present invention is not limited to this. The inter-terminal communication system 1 may provide an information sharing function during text communication. For example, the inter-terminal communication system 1 may provide an information sharing function during chat provided by a text chat application.

  As mentioned above, although embodiment of this invention and its deformation | transformation were demonstrated, these embodiment and its deformation | transformation were shown as an example and are not intending limiting the range of invention. These embodiments and modifications thereof can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and at the same time, are included in the invention described in the claims and equivalents thereof.

  Each of the above devices has a computer inside. The process of each device described above is stored in a computer-readable recording medium in the form of a program, and the above-described processing is performed by the computer reading and executing the program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

The program may be for realizing a part of the functions described above.
Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Communication system between terminals, 10 ... Terminal device, 20 ... Signaling server, 30 ... Authentication server, 40 ... Push server, 50 ... Relay server

Claims (6)

A terminal information receiving unit for receiving terminal information including terminal identification information for identifying a terminal device and application identification information for identifying an application operating in the terminal device from the terminal device;
A session between a first application that operates on a first terminal device among the plurality of terminal devices and a second application that operates on a second terminal device different from the first terminal device among the plurality of terminal devices. The session building department to build,
Compatibility between the first application and a third application that operates in a third terminal device different from the first terminal device and the second terminal device among the plurality of terminal devices is determined as the terminal identification information or the application identification. A suitability determination unit for determining based on the information;
A determination result transmission unit that transmits a determination result by the suitability determination unit to the first application in response to an information sharing request transmitted by the first application;
With
The session is constructed based on key information corresponding to the session,
The session construction unit
In response to a request to start communication with the third application transmitted by the first application, a session between the first application and the third application is transmitted to the terminal information of the first terminal device and the third application. Based on the terminal information of the terminal device,
When a peer-to-peer mode session is established in which the first terminal device and the second terminal device communicate directly, a request for voice communication from the third terminal device to the first terminal device is received. In response, key information corresponding to a session between the first application and the second application is created in a relay server that relays information sharing communication, which is communication that enables information sharing between the plurality of terminal devices. is allowed, based on the transmitted the key information from the relay server to the first terminal device and said second terminal apparatus, by switching from session of the peer-to-peer mode, the session of the relay mode via the relay server Is constructed between the first application and the second application, and the first application and the second application Based on the key information corresponding to the session between ® emissions, terminal communication system for constructing a session of the relay mode between the first application and the third application. In response to the communication start request with the third application transmitted by the first application, the session construction unit performs a session between the second application and the third application of the second terminal device. The inter-terminal communication system according to claim 1, wherein the communication is established based on the terminal information and the terminal information of the third terminal device. The session construction unit constructs a session between the second application and the third application based on second terminal identification information for identifying the second terminal device transmitted from the first application. The inter-terminal communication system according to 2. A transmission determination unit that determines whether or not the first application transmits information received from either the second application or the third application to the other application;
The inter-terminal communication system according to any one of claims 1 to 3, further comprising: A terminal information receiving unit for receiving terminal information including terminal identification information for identifying a terminal device and application identification information for identifying an application operating in the terminal device from the terminal device;
A session between a first application that operates on a first terminal device among the plurality of terminal devices and a second application that operates on a second terminal device different from the first terminal device among the plurality of terminal devices. The session building department to build,
Compatibility between the first application and a third application that operates in a third terminal device different from the first terminal device and the second terminal device among the plurality of terminal devices is determined as the terminal identification information or the application identification. A suitability determination unit for determining based on the information;
A determination result transmission unit that transmits a determination result by the suitability determination unit to the first application in response to an information sharing request transmitted by the first application;
With
The session is constructed based on key information corresponding to the session,
The session construction unit
In response to a request to start communication with the third application transmitted by the first application, a session between the first application and the third application is transmitted to the terminal information of the first terminal device and the third application. Based on the terminal information of the terminal device,
When a peer-to-peer mode session is established in which the first terminal device and the second terminal device communicate directly, a request for voice communication from the third terminal device to the first terminal device is received. In response, key information corresponding to a session between the first application and the second application is created in a relay server that relays information sharing communication, which is communication that enables information sharing between the plurality of terminal devices. is allowed, based on the transmitted the key information from the relay server to the first terminal device and said second terminal apparatus, by switching from session of the peer-to-peer mode, the session of the relay mode via the relay server Is constructed between the first application and the second application, and the first application and the second application Based on the key information corresponding to the session between ® down, to build a session of the relay mode between the first application and the third application server. A communication method between terminals in a communication system between terminals including a terminal device and a server,
A first step in which the server receives terminal information including terminal identification information for identifying the terminal apparatus and application identification information for identifying an application operating in the terminal apparatus from the terminal apparatus;
A first application that operates on a first terminal device among the plurality of terminal devices; and a second application that operates on a second terminal device different from the first terminal device among the plurality of terminal devices. A second step of building a session between,
The terminal identification information indicates compatibility between the first application and a third application that operates on a third terminal device different from the first terminal device and the second terminal device among the plurality of terminal devices. Or a third step of determining based on the application identification information;
A fourth step in which the server transmits a determination result in the third step to the first application in response to an information sharing request transmitted by the first application;
In response to a request to start communication with the third application transmitted by the first application, the server sends a session between the first application and the third application to the terminal information of the first terminal device. And a fifth step constructed based on the terminal information of the third terminal device;
Including
The session is constructed based on key information corresponding to the session,
In the fifth step, when the server establishes a peer-to-peer mode session in which the first terminal device and the second terminal device communicate directly, the third terminal device sends the second In response to a request for voice communication to one terminal device, the first application and the second application are relayed to a relay server that relays information sharing communication, which is communication that enables information sharing between the plurality of terminal devices . Key information corresponding to the session between the relay server , based on the key information transmitted from the relay server to the first terminal device and the second terminal device, switch from the peer-to-peer mode session, with building a session relay mode via the relay server between the first application second application, wherein Based on the key information corresponding to the session between the one application second application, terminal-to-terminal communication method for constructing a session of the relay mode between the first application and the third application.

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