Terminal device, communication method, and program

Abstract

The present invention provides a terminal device, a communication method, and a program that reduce delays in voice calls. [Solution] In a communication system, the terminal device comprises a communication unit, a communication quality information generation unit that generates communication quality information, a connection destination identification unit that identifies a second server device different from the first server device, a connection management unit that connects to the server device, a request information transmission unit that transmits multi-session request information including connection request list information to other terminal devices, a response information receiving unit that acquires multi-session response information including connection request list information from other terminal devices, and a response information transmission unit that transmits multi-session response information including the number of connections permitted to the server device and the connection priority of the connection information between the terminal device and the server device. When the connection management unit acquires multi-session response information from the response information receiving unit, it generates common connection list information based on the number of connections permitted to its own terminal device and the number of connections permitted to other terminal devices, and connects its own terminal device to the server device.

Description

Technical Field

[0001] The present invention relates to a terminal device, a communication method, and a program.

Background Art

[0002] A PoC (Push-To-Talk over Cellular) terminal device and a PoC between the server devices are connected by a wireless network such as LTE (Long Term Evolution) and a wired network such as an optical fiber line. A PoC system is known (see, for example, Patent Document 1). [

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] <000"028>In a PoC system, depending on the usage environment, when the communication quality deteriorates or a delay occurs in a voice call, it may be considered to switch the connected server device and continue the voice call. However, if the server device to be connected is switched during a voice call, it takes time to resume the call after connecting to the new server device, and the voice may be interrupted due to loss or retransmission of voice packets.

[0005] <000003"8>[[ID=5"3]]An object of the present invention is to provide a terminal device, a communication method, and a program that can easily switch a server device.

Means for Solving the Problems

[0006] ​​ The terminal device of the present invention comprises a communication unit that communicates with a terminal device of a communication partner, and a plurality of server devices. A communication quality information generation unit measures the communication quality and generates communication quality information indicating the communication quality, Based on the aforementioned communication quality information, the first server, which is the current target of the connection, is selected from among the multiple server devices. A connection destination identification unit that identifies a second server device different from the device, and a unit that generates connection list information and A connection management unit controls the communication unit to update and connect to the server device, and connection request The system generates list information and sends multi-session request information, including the connection request list information, to other terminals. A request information transmission unit controls the communication unit to transmit to the device, and a connection from the other terminal device. Control the communication unit to acquire multi-session response information, including the continuation request list information. A response information receiving unit, including the number of connections permitted to the server device, and connection information between the server device and the server device. It includes a response information transmission unit that transmits multi-session response information with connection priority, When the connection management unit obtains multi-session response information in the response information receiving unit, Based on the number of connections permitted by your own terminal device and the number of connections permitted by other terminal devices, a common connection list is created. The system generates information, and based on the common connection list information, the local terminal device and the server device Control the communication unit to establish a connection.

[0007] The communication method of the present invention measures the communication quality with a plurality of server devices and indicates the communication quality The steps include generating communication quality information and, based on the communication quality information, determining the performance of multiple server devices. The steps include identifying a second server device that is different from the first server device that is currently connected to, and The steps include generating and updating connection list information, connecting to the server device, and connection request The system generates list information and sends multi-session request information, including the connection request list information, to other terminals. Steps to send to the device and multiset information including connection request list information from other terminal devices The steps include obtaining and receiving response information, and the number of connections permitted to the server device. A server sends multi-session response information, including connection priority, for connection information between the server and other devices. When a step is performed and multi-session response information is obtained in the receiving step, Based on the number of connections permitted for each terminal device and the number of connections permitted for other terminal devices, a common connection list information is generated. The system generates a common connection list information, and based on this, the local terminal device and the server device are connected. The steps include,

[0008] The program of the present invention measures the communication quality with multiple server devices and indicates the communication quality. The steps include generating communication quality information and, based on the communication quality information, multiple server devices This step identifies a second server device that is different from the first server device that is currently connected. The steps include generating and updating connection list information and connecting to the server device, and connection requirements The system generates a request list information and provides multi-session request information including the connection request list information to the other end. The steps include sending to the terminal device and a multi-set information including the connection request list information from the other terminal device. This includes the steps of obtaining and receiving response information, and the number of connections permitted to the server device. Sends multi-session response information, including connection priority, for connection information between the server device and the server device. Steps include, and if multi-session response information is obtained in the receiving step, Based on the number of connections permitted by your own terminal device and the number of connections permitted by other terminal devices, a common connection list information is generated. The system generates information and, based on the common connection list information, determines whether the local terminal device and the server device are connected. Cause the computer to execute the subsequent steps and

Advantages of the Invention

[0009] According to the present invention, the switching of the server device can be easily performed.

Brief Description of the Drawings

[0010] [Figure 1] FIG. 1 is a diagram showing a configuration example of a communication system according to the first embodiment. [Figure 2] FIG. 2 is a block diagram showing a configuration example of a terminal device according to the first embodiment. [Figure 3] FIG. 3 is a block diagram showing a configuration example of a server device according to the first embodiment. [Figure 4] FIG. 4 is a flowchart showing the processing content of the terminal device according to the first embodiment. [Figure 5] FIG. 5 is a block diagram showing a configuration example of a terminal device according to the second embodiment. [Figure 6] FIG. 6 is a flowchart showing the processing content of the terminal device according to the second embodiment.

Modes for Carrying Out the Invention

[0014] Server devices 12-1 to 12-3 are PoC servers. Terminal device 10- 1 and terminal device 10-2 are PoC terminals. That is, communication system 1 is a PoC This is a system that supports [this].

[0015] Server devices 12-1 to 12-3 are each included in communication system 1. Terminal devices 10-1 and 10-2 are registered as terminal devices. Server device Server devices 12-1 through 12-3 are, respectively, terminal device 10-1 and terminal device 10- Regarding point 2, the same registration information, such as group settings, is stored. From server device 12-1 Server devices 12-3 do not communicate with each other. From device 12-1 to server device 12-3, identify the terminal device 10 with which communication is taking place. It is possible.

[0016] Terminal device 10-1 is connected to server device 12-1 via network N1. Terminal device 10-1 is connected to server device 12-2 via network N2. The terminal device 10-1 is connected to the server device 12-3 via network N3. Furthermore, terminal device 10-1 is different from server devices 12-1 to 12-3. It is connected via a network. Terminal device 10-1 receives a server from server device 12-1. Communication sessions can be maintained with each of the B devices 12-3.

[0017] Terminal device 10-2 is connected to server device 12-1 via network N4. Terminal device 10-2 is connected to server device 12-2 via network N5. The terminal device 10-3 is connected to the server device 12-3 via network N6. Furthermore, terminal device 10-2 is different from server devices 12-1 to 12-3. It is connected via a network. Terminal device 10-2 receives a server from server device 12-1. Communication sessions can be maintained with each of the B devices 12-3.

[0018] Networks N1 through N6 are wireless and wired networks. It is a network that includes [this]. There is no need to distinguish between networks N1 to N6. In some cases, it may be collectively referred to as network N. Here, terminal device 10-1 and terminal device In the network connection between the 10-2 unit and the server device 12, network N1 Network N6 uses different communication connections and communication paths for each communication session. It is desirable that such connections be established. Each different communication connection and communication path is physically different. Communication channels, logically different communication channels, different communication methods, different frequencies, different time It would be preferable to be based on time slots. Terminal devices 10-1 and 10-2 are... It is configured to connect to multiple different networks and enable multi-session connections. It would be good if it were done.

[0019] Communication system 1 allows terminal device 10-1 and terminal device 10-2 to connect with each other. Information about multiple server devices 12 is shared. The communication system 1 is connected to terminal device 10-1 and multi-session connections to the server device 12 when multiple connections are made to the terminal device 10-2. To establish a continuation.

[0020] (Terminal device) An example of the configuration of a terminal device according to the first embodiment will be described using Figure 2. This is a block diagram showing an example configuration of a terminal device according to an embodiment.

[0021] As shown in Figure 2, the terminal device 10 includes an input unit 20, a display unit 22, a microphone 24, and It includes a speaker 26, a storage unit 28, a communication unit 30, and a control unit 32.

[0022] The input unit 20 receives various input operations to the terminal device 10. The control unit 32 outputs an operation signal corresponding to the input operation that was set. The input unit 20 is, for example, a Includes touch panel, buttons, switches, PTT (Push-to-Talk) button, etc. When a touch panel is used as the input unit 20, the input unit 20 is displayed on the display unit 22. It will be placed.

[0023] The display unit 22 displays various types of images. The display unit 22 is, for example, a liquid crystal display, It is a display that includes EL (Electro-Luminescence) technology.

[0024] Microphone 24 is a microphone that detects sound around the terminal device 10. The microphone 24 detects the voice of the user using the terminal device 10. The microphone 24 records the detected voice as an audio signal. Convert to [the desired result].

[0025] Speaker 26 is a speaker that outputs various types of sound.

[0026] The memory unit 28 stores various types of information. The memory unit 28 stores the calculation contents of the control unit 32, It stores information such as programs. The storage unit 28 is, for example, RAM (Random A Access Memory and ROM (Read Only Memory) Of the main memory and external storage devices such as HDDs (Hard Disk Drives), It must include at least one.

[0027] The communication unit 30 is a communication interface that performs communication between the terminal device 10 and an external device. The communication unit 30 performs communication between the terminal device 10 and the server device 12.

[0028] The control unit 32 controls each part of the terminal device 10. For example, the control unit 32 controls the CPU (Ce (Central Processing Unit) or MPU (Microprocessor) Information processing devices such as (ing Unit) and RAM (Random Access Memory) It has a storage device such as a mory or ROM (Read Only Memory). The control unit 32 executes a program that controls the operation of the terminal device 10 according to the present invention. Section 32 is, for example, ASIC (Application Specific Integra rated circuit) and FPGA (Field Programmable It may be implemented by an integrated circuit such as a gate array. The control unit 32 is hardware It can be implemented through a combination of hardware and software.

[0029] The control unit 32 includes a communication quality information generation unit 40, a connection destination identification unit 42, and a connection management unit 44. It comprises a request information transmission unit 46, a response information receiving unit 48, and a codec unit 50.

[0030] The communication quality information generation unit 40 generates the communication status between the terminal device 10 and the multiple server devices 12. The communication quality, which indicates the quality, is measured. The communication quality information generation unit 40, for example, measures the communication quality as Bitrate can be measured, but is not limited to this. For example, as communication quality, terminal device 1 The amount of delay in communication between 0 and multiple server devices 12 may be measured. The method used is not limited to well-known methods. The communication quality information generation unit 40 measures It generates communication quality information that indicates a set communication quality.

[0031] The connection destination identification unit 42 identifies a server device 12 that could be a candidate for communication destination of the terminal device 10. Specifically, the connection destination identification unit 42 receives the communication quality information generated by the communication quality information generation unit 40. Based on this, a candidate for the connection destination will be different from the currently connected server device 12. Identify server device 12. Server device 12, which is the current target of terminal device 10's connection, is Also called a server device. The server device 12 that is a candidate for communication destination of terminal device 10 is second Also known as a server device.

[0032] The connection management unit 44 establishes connections with multiple server devices 12 included in the communication system 1. Specifically, the connection management unit 44 registers multiple server devices 12. By making this request, connections with multiple server devices 12 are established.

[0033] The connection management unit 44 identifies server devices 12 that are candidates for connection destinations of terminal devices 10, and other terminal devices At least one of the candidate server devices 12 to which the device 10 is connected. This is connected as a common server device 12 between terminal device 10 and other terminal devices 10.

[0034] The request information transmission unit 46 initiates communication with another terminal device 10, or with another terminal device At the time 10 is identified, it includes connection information to the candidate server device 12 to which it is connected. Send multi-session request information to other terminal devices 10. Connection information to server device 12. This includes information indicating that a connection to server device 12 is possible.

[0035] The response information receiving unit 48 receives information from other terminal devices 10 as a candidate for connection to other terminal devices 10. The multi-session request information includes connection information to the server device 12. Receive response information.

[0036] The codec unit 50 compresses audio information to be transmitted to the server device 12, for example, as desired. The audio information is compressed using the following method. The codec unit 50, for example, receives audio information from the server device 12. Decrypt.

[0037] An example of the configuration of a server device according to the first embodiment will be described using Figure 3. This is a block diagram showing an example configuration of a server device according to one embodiment.

[0038] As shown in Figure 3, the server device 12 includes a communication unit 60, a storage unit 62, and a control unit 64. It is equipped with.

[0039] The communication unit 60 is a communication interface that performs communication between the server device 12 and an external device. The communication unit 60 performs communication between the server device 12 and the terminal device 10.

[0040] The memory unit 62 stores various types of information. The memory unit 62 stores the calculation contents of the control unit 64, It stores information such as programs. The storage unit 62 includes, for example, RAM and ROM. It includes at least one of the following: main memory, external storage devices such as HDDs, etc.

[0041] The control unit 64 controls various parts of the server device 12. For example, the control unit 64 controls the CPU and M It has an information processing device such as a PU and a storage device such as RAM or ROM. The control unit 64 The control unit 64 executes a program that controls the operation of the server device 12 according to the present invention. For example, it may be implemented by an integrated circuit such as an ASIC or FPGA. The control unit 64 is It can be implemented using a combination of hardware and software.

[0042] The control unit 64 includes a registration management unit 70, a session management unit 72, and terminal information Management Unit 74, Group Information Management Unit 76, Switching Request Signal Management Unit 78, Switching Ready to Switch signal It includes a number management unit 80.

[0043] The registration management unit 70 accepts registrations from each terminal device 10. The registration management unit 70 will process the terminal device 10 that has received the registration. Register it as a communication-enabled terminal device 10.

[0044] The session management unit 72 manages the communication session with the terminal device 10. For example, the control unit 72 receives voice information from one terminal device 10 and transmits it to another terminal device 10 via voice. Send the information.

[0045] The terminal information management unit 74 performs various operations related to the terminal device 10 that has received registration. The information is stored in the storage unit 62.

[0046] The group information management unit 76 manages the group to which the terminal device 10 stored in the storage unit 62 belongs. Manage group information related to the project.

[0047] The switching request signal management unit 78 manages the switching request signals received from the terminal device 10. The request signal management unit 78 sends the switching request signal received from one terminal device 10 to another terminal device 10. I believe.

[0048] The switching readiness complete signal management unit 80 manages the switching readiness complete signal. Unit 80 receives the switching readiness signal from the receiving terminal device 10 to the transmitting terminal device 1 Send to 0.

[0049] (Processing details) The processing content of the terminal device according to the first embodiment will be explained using Figure 4. This is a flowchart showing the processing details of the terminal device according to one embodiment.

[0050] In the following example shown in Figure 1, terminal device 10-1 is the transmitting terminal device 10. Terminal device 10-2 is assumed to be the receiving terminal device 10. The process shown in Figure 4 is performed by the terminal device Both 10-1 and terminal device 10-2 have limitations on the number of multi-session connections. This shows how to handle the case where it does not exist.

[0051] The communication quality information generation unit 40 of terminal device 10-1 indicates the communication quality with each server device 12. Generate communication quality information (step S10). Specifically, the communication quality of terminal device 10-1. The information generation unit 40 measures the communication quality with each server device 12 and generates communication quality information. Then, proceed to step S12.

[0052] The connection destination identification unit 42 of terminal device 10-1 is connected to terminal device 10-1 and the terminal device 10-1 Whether or not the communication quality of all communications with the server device 12 targeted for the multi-session was obtained. Determine (Step S12). Specifically, the connection destination identification unit 42 of terminal device 10-1 determines the connection Determine whether or not the communication quality of the communication with the next candidate server device 12 could be obtained. It was determined that the communication quality with the server device 12, which is subject to multi-session, could be fully obtained. If so (Step S12; Yes), proceed to Step S14. If it is not determined that the communication quality with the berth device 12 has been fully acquired (step S12; No), proceed to step S16.

[0053] If Yes is determined in step S12, the request information transmission unit 46 of the terminal device 10-1 The multi-session request information, including connection information to the server device 12, is sent to the other terminal device 10. Send (step S14). Then proceed to step S18.

[0054] If No is determined in step S12, the connection management unit 44 of terminal device 10-1 will connect The target network N is connected to the current server device 12 via network N, and communication is initiated from there. Switch to the next network N for which quality has not been obtained (step S16). Then, Proceed to step S10.

[0055] The response information receiving unit 48 of terminal device 10-1 receives information from terminal device 10-2. Multi-session response information including connection information to the server device 12 which is a candidate for connection destination. Receive (step S18). Then proceed to step S20.

[0056] The connection management unit 44 of terminal device 10-1 generates connection list information (step S20). Specifically, the connection management unit 44 of terminal device 10-1 uses the connection information of terminal device 10-1 and The connection information of terminal device 10-2 is integrated to generate connection list information. Connection list information This refers to the information of the server device 12, which is commonly connected to terminal device 10-1 and terminal device 10-2. This includes [something]. Then proceed to step S22.

[0057] The connection management unit 44 of terminal device 10-1, based on the generated connection list information, controls each server A multi-session connection is established with device 12 (step S22). Then, the process shown in Figure 4 is completed. do.

[0058] As described above, in the first embodiment, if there is no upper limit on the number of multi-sessions, the transmitting side Server device included in the connection information between terminal device 10 and receiving terminal device 10 A multi-session connection is established using 12 as the common connection destination. Thus, in the first embodiment, When a call is initiated between terminal devices 10, the server device 12 to be connected to is switched. However, it is possible to prevent audio interruptions and easily switch between server devices. Cut.

[0059] [Second Embodiment] (Terminal device) An example of the configuration of a terminal device according to the second embodiment will be explained using Figure 5. This is a block diagram showing an example configuration of a terminal device according to an embodiment.

[0060] As shown in Figure 5, the terminal device 10A has a control unit 32A which includes a response information transmission unit 52. Therefore, it differs from the terminal device 10 shown in Figure 2.

[0061] The response information transmission unit 52 transmits multi-session response information to other terminal devices 10. Specifically, the response information transmission unit 52 includes the number of connections to the server device 12 and the connection priority. Send multi-session response information.

[0062] (Processing details) The processing content of the terminal device according to the second embodiment will be explained using Figure 6. This is a flowchart showing the processing details of the terminal device according to the second embodiment.

[0063] The process shown in Figure 6 is such that both terminal device 10-1 and terminal device 10-2 are marked with a circle. This section describes how to handle situations where there is a limit on the number of connections in a session.

[0064] The processes from step S30 to step S34 are shown in Figure 4, respectively, as shown in step S10. Since this is the same process as in steps S12 and S16, the explanation will be omitted.

[0065] If the result in step S32 is determined to be Yes, the connection management unit 44 updates the connection list information. (Step S36). Specifically, the connection management unit 44, for example, the connection of the server device 12 Based on the information provided and the communication quality information, approximately 12 server devices with good communication quality will be selected as connection targets. Update the connection list information to give it a higher priority. Then proceed to step S38. nothing.

[0066] The connection management unit 44 of terminal device 10-1 generates connection request list information (step S3 8) Specifically, the connection management unit 44 of terminal device 10-1 receives connection list information and connects Based on the number of connection requests, which indicates the number of requests from server device 12, connection request list information is generated. The number of connection requests is set to be less than or equal to the maximum number of connections for a multi-session. Proceed to S40.

[0067] The request information transmission unit 46 of terminal device 10-1 transmits multi-session request information to terminal device 10 -2 is sent (step S40). Specifically, terminal device 10-1 The request information transmission unit 46 transmits a multi-session request information including a connection request information list for the terminal device 10. The requested information is sent to another terminal device 10. Then, the process proceeds to step S42.

[0068] The response information receiving unit 48 of terminal device 10-1 receives multi-session response information from terminal device 10 -Received from 2 (step S42). Specifically, the response information receiving unit of terminal device 10-1. 48 is the number of connections permitted for terminal device 10-2 to server device 12 and connection request list information. The system receives multi-session response information, including the information itself, from terminal device 10-2. Then, step S4 Proceed to step 4.

[0069] The connection management unit 44 of terminal device 10-1 grants permission for connection to the server device 12 of terminal device 10-1. The number is calculated (step S44). Specifically, the connection management unit 44 of terminal device 10-1, The number of allowed connections is calculated from the number of available sessions. Then, the process proceeds to step S46.

[0070] The response information transmission unit 52 of terminal device 10-1 includes the number of connections permitted for terminal device 10-1. The session response information is sent to the terminal device 10-2 (step S46). Then, Proceed to S48.

[0071] The connection management unit 44 of terminal device 10-1 is common to terminal device 10-1 and terminal device 10-2. The connection list information is generated (step S48). Specifically, the connection of terminal device 10-1 The management unit 44 is based on the number of connections permitted for terminal device 10-1 and the number of connections permitted for terminal device 10-2. Next, common connection list information is generated. Then, the process proceeds to step S50.

[0072] The connection management unit 44 of the terminal device 10-1, based on the generated common connection list information, A multi-session connection is established with the server device 12 (step S50). Then, the process shown in Figure 6 is performed. Ending.

[0073] As described above, in the second embodiment, if there is an upper limit on the number of multi-sessions, the transmitting side The priority order between the terminal device 10 and the receiving terminal device 10 is determined based on the number of permitted connections. This establishes a multi-session connection. As a result, in the second embodiment, calls are made between terminal devices 10. If initiated, the audio will not be interrupted even if the target server device 12 is switched. This makes it possible to easily switch between server devices.

[0074] Each component of the illustrated device is a functional concept and is not necessarily physically represented as shown. It is not required that the configuration be as shown. In other words, the specific form of distribution and integration of each device is as shown in the diagram. Not limited to this, all or part thereof may be used in any unit depending on the type of load and usage conditions. It can be configured by distributing and integrating functionally or physically. The configuration may be performed dynamically.

[0075] Although embodiments of the present invention have been described above, the present invention is not limited to the contents of these embodiments. It is not that. Furthermore, the aforementioned components include those that can be easily anticipated by a person skilled in the art, and those that are substantial. This includes identical items, or items within the so-called equal range. Furthermore, the aforementioned components are used as appropriate. It is possible to combine them. Furthermore, without departing from the gist of the embodiments described above, Various omissions, substitutions, or modifications of constituent elements are permitted. [Explanation of symbols]

[0076] 1. Communication System 10 Terminal devices 12 Server devices 20 Input section 22 Display section 24 Mike 26 speakers 28, 62 Memory section 30,60 Communications Department 32,64 Control Unit 40 Communication Quality Information Generation Unit 42 Connection destination identification section 44 Connection Management Department 46 Request Information Transmission Unit 48 Response Information Receiving Unit 50 Codec Section 52 Response Information Transmission Unit 70 Registration Management Department 72 Session Management Department 74 Terminal Information Management Department 76 Group Information Management Department 78 Switching Request Signal Management Unit 80 Switching ready signal management section

Claims

1. A communication unit that communicates with the terminal device of the communication partner, Measure the communication quality with multiple server devices and generate communication quality information indicating the aforementioned communication quality. Communication quality information generation unit, Based on the aforementioned communication quality information, the first server among the multiple server devices that is currently connected is selected. A connection destination identification unit that identifies a second server device different from the B device, The communication unit generates and updates connection list information and controls the connection to the server device. The connection management department in charge, A connection request list information is generated, and multi-session request information including the connection request list information is generated. A request information transmission unit controls the communication unit to transmit information to other terminal devices, The multi-session response information, including the connection request list information from the aforementioned other terminal devices, is acquired. A response information receiving unit controls the communication unit, Includes the number of permitted connections to the server device, along with connection priority information for connections to and from the server device. It comprises a response information transmission unit that transmits multi-session response information, The connection management unit acquires multi-session response information in the response information receiving unit. In this case, based on the number of connections permitted by your own terminal device and the number of connections permitted by other terminal devices, a common connection limit is established. The system generates connection information and, based on the common connection list information, connects the local terminal device and the server device. Control the communication unit so that it connects to the Terminal device.

2. Measure the communication quality with multiple server devices and generate communication quality information indicating the aforementioned communication quality. Steps and Based on the aforementioned communication quality information, the first server among the multiple server devices that is currently connected is selected. The step of identifying a second server device that is different from the B device, The steps include generating and updating connection list information and connecting to the server device, A connection request list information is generated, and multi-session request information including the connection request list information is generated. The steps include sending the information to other terminal devices, The multi-session response information, including the connection request list information from the aforementioned other terminal devices, is acquired. , the receiving step, Includes the number of permitted connections to the server device, along with connection priority information for connections to and from the server device. The steps include sending multi-session response information, If multi-session response information is obtained in the aforementioned receiving step, the terminal device Based on the number of allowed connections for this device and the number of allowed connections for other terminal devices, a common connection list information is generated. Based on the common connection list information, the terminal device and the server device are connected. Top, A communication method that includes this.

3. Measure the communication quality with multiple server devices and generate communication quality information indicating the aforementioned communication quality. Steps and Based on the aforementioned communication quality information, the first server among the multiple server devices that is currently connected is selected. The step of identifying a second server device that is different from the B device, The steps include generating and updating connection list information and connecting to the server device, A connection request list information is generated, and multi-session request information including the connection request list information is generated. The steps include sending the information to other terminal devices, The multi-session response information, including the connection request list information from the aforementioned other terminal devices, is acquired. , the receiving step, Includes the number of permitted connections to the server device, along with connection priority information for connections to and from the server device. The steps include sending multi-session response information, If multi-session response information is obtained in the aforementioned receiving step, the terminal device Based on the number of allowed connections for this device and the number of allowed connections for other terminal devices, a common connection list information is generated. Based on the common connection list information, the terminal device and the server device are connected. Top, A program that causes a computer to execute something.

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