JP2008252830A - Conference system and terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conference system in which statuses of terminal devices participating in a conference speech can be known, and the terminal devices. <P>SOLUTION: A conference server 1 generates a terminal device list in response to a change in the amount of terminal devices 2 participating in a conference speech such as when starting the conference speech or ending the conference speech among the terminal devices participating in the conference speech, and transmits the terminal device list to the terminal devices 2 participating in the conference speech. Each terminal device 2 receiving the terminal device list detects a status of another terminal device 2 participating in the conference speech on the basis of the terminal device list and changes an indication on a display unit based on a result of the detection. Thus, a user of the terminal device 2 is enabled to easily identify the terminal devices 2 participating in the conference speech. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a conference system capable of making a call simultaneously with a plurality of terminal devices.

  Conventionally, a conference system has been proposed that realizes a conference call in which calls are made simultaneously between a plurality of terminal devices via a network (see, for example, Patent Document 1). When a conference call is performed in this system, first, each terminal device connects to a communication server, and transmits voice data based on voice input from the user to the communication server. In this communication server, the voice data received from each terminal device is edited to generate one voice data, which is returned to each terminal device. By outputting the voice based on the returned voice data, each terminal device can make a conference call between the terminal devices connected to the communication server.

Japanese Patent Laid-Open No. 7-123090

  However, in the conventional system, since the conference call is realized by transmitting and receiving voice data with the server device, not between the terminal devices participating in the conference call, the state of other terminal devices participating in the conference call is known. I couldn't. For this reason, for example, even if all the other terminal devices participating in the conference call end the conference call, this may not be noticed.

  Then, this invention aims at providing the conference system and terminal device which can know the state of the terminal device which has participated in the conference call.

  In order to solve the above-described problems, the conference system according to the present invention edits audio data received via a network and a plurality of terminal devices that transmit and receive audio data via the network. A conference that includes a server device that transmits voice data to a network, and realizes a conference call in which a plurality of terminal devices participate by transmitting and receiving voice data between the plurality of terminal devices and the server device via the network The server device is a list generating unit that generates a terminal device list of terminal devices participating in one conference call, and an interface that transmits the terminal device list to the terminal devices participating in the conference call The terminal device represents the terminal devices participating in the conference call based on the terminal device list received from the server device. Characterized in that it comprises a display control unit for displaying device.

  In the conference system, the list generation unit may generate a terminal device list when the number of terminal devices participating in the conference call changes.

  In the conference system, the terminal device further includes a plurality of operation detection devices that detect user operation inputs relating to call control, the display device is provided for each operation detection device, and the display control unit is a terminal that participates in the conference call A display device may be associated with each device.

  In the conference system, the terminal device further includes a call control unit that controls a call with a terminal device that participates in the same conference call, and the display control unit corresponds to a call control state with the terminal device that participates in the conference call. Thus, the display on the display device may be controlled.

  Moreover, the terminal device according to the present invention is a terminal of a conference system that realizes a conference call in which a plurality of terminal devices participate by performing transmission and reception of audio data between the plurality of terminal devices and the server device via a network. A display unit configured to display a terminal device participating in the conference call on a display device based on a terminal device list related to the terminal device participating in the conference call received via the network. Features.

  According to the present invention, the terminal device participating in the conference call is displayed on the display unit based on the terminal device list related to the terminal device participating in the conference call. It is possible to know the state of the terminal devices participating in.

[Conference system]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the conference system according to the present embodiment includes a conference server 1, terminal devices 2 a to 2 d, and a known SIP server 3, each of which includes a LAN (Local Area Network) and a WAN. (Wide Area Network), connected via a network 4 including a communication line such as the Internet or a telephone line. In the present embodiment, four terminal devices 2a to 2d are provided. However, the number of terminal devices 2a to 2d is not limited to four, and can be freely set as appropriate. For convenience, the terminal devices 2a to 2d will be described as the terminal device 2 in the following description.

<Conference server>
As shown in FIG. 2, the conference server 1 includes I / F units 11 a to 11 d, an edit processing unit 12, and a control unit 13.

  The I / F units 11a to 11d are composed of communication circuits, and are connected to the network 4 via communication lines 11a-1 to 11d-1. Thus, data communication is performed with the terminal device 2 and the SIP server 3 via the network 4 to exchange various data such as voice data and control signals with each device. Such I / F units 11a to 11d are provided as many as the terminal devices 2 participating in the conference system. Therefore, in the case of the conference system shown in FIG. 1, since four terminal devices 2a to 2d are provided, four I / F units 11a to 11d are provided as shown in FIG.

  The edit processing unit 12 includes a signal processing circuit, synthesizes audio data input from the I / F units 11a to 11d, generates one audio data (hereinafter referred to as conference data), and generates the audio data. It transmits to each terminal device 2 via 11a-11d.

  The control unit 13 includes a microprocessor such as a CPU and its peripheral circuits, and reads and executes an operation program from a storage device (not shown) provided in the conference server 1 to cooperate the hardware and the program. Thus, the operation control unit 13a and the list generation unit 13b are realized.

The operation control unit 13 a controls operations of the I / F units 11 a to 11 c and the editing processing unit 12 and data communication between the terminal devices 2 a to 2 c and the SIP server 3.
The list generation unit 13b generates a terminal device list related to terminal devices participating in the conference call. The terminal device list includes a list of terminal devices 2 participating in the same conference call, and includes information for identifying each terminal device 2 such as an IP address, a telephone number, an extension number, and a name. Such a terminal device list can be generated based on information received from the SIP server 3 or a telephone book stored in advance in the terminal device 2. The terminal device list may also include an identification number (hereinafter referred to as a conference number) that identifies which conference call among a plurality of conference calls realized by the conference server 1.

<Terminal device>
The terminal device 2 includes an I / F unit 21, an audio processing unit 22, an operation input unit 23, a display unit 24, a storage unit 25, a control unit 26, an HS (Hand Set) 27, and an SP (Speaker). 28).

  The I / F unit 21 includes a communication circuit and is connected to the network 4 via a communication line 21a. As a result, data communication is performed with the conference server 1, another terminal device 2, and the SIP server 3 via the network 4, and various data such as voice data and control signals are exchanged with each device. Such an I / F unit 21 can simultaneously establish a plurality of call paths. Thereby, for example, data communication can be performed between a plurality of devices such as the conference server 1 and another terminal device 2 at the same time.

  The audio processing unit 22 includes a signal processing circuit, decodes the audio data input from the I / F unit 21 and outputs it from the HS 27 or SP 28, and encodes the audio signal input from the HS 27 into audio data to generate I / F unit 21 outputs.

  The operation input unit 23 includes operation input devices such as dial keys, function keys, and hook switches. The operation input unit 23 detects user operations and outputs them to the control unit 26.

  The display unit 24 includes a display device such as an LED (Light Emitting Diode) or an LCD (Liquid Crystal Display), and performs various visual displays such as a call state in response to an instruction from the control unit 26. Here, a display device such as an LED may be provided on a function key constituting the operation input unit 23.

  The storage unit 25 includes a storage device such as a memory or a hard disk, and stores control data 25a, a terminal device list 25b, and a program 25c. Here, the control data 25 a is information used for controlling the terminal device 2. Further, the terminal device list 25 b is configured from a terminal device list received from the conference server 1. The program 25 c is an operation program for the terminal device 2 and is stored in the storage unit 25 in advance. The program 25c may be stored in the storage unit 25 via a recording medium such as a DVD (Digital Versatile Disk) or a CD (Compact Disk) or a network.

  The control unit 26 includes a microprocessor such as a CPU and its peripheral circuits, and reads the program 25c from the storage unit 25 and executes it, thereby causing the hardware and the program 25c to cooperate with each other, and the call control unit 26a and the detection unit 26b. And the display control part 26c is implement | achieved.

  The call control unit 26a controls calls with other devices by controlling the operations of the I / F unit 21 and the voice processing unit 22 based on the control data 25a of the storage unit 25. Thereby, a conference call using the conference server 1 and a call with another terminal device are realized. Such a call control unit 26a can simultaneously control a plurality of calls, such as the conference server 1 and another terminal device 2.

  The detection unit 26b detects the state of the terminal device 2 participating in the conference call based on the terminal device list 25b in the storage unit 25.

  The display control unit 26c controls the display state of the display unit 24 based on the state of call control by the call control unit 26a and the detection result of the detection unit 26b.

  An HS (Hand Set) 27 detects a voice emitted from a receiver 27a that converts the voice signal input from the voice processing unit 22 into a voice and outputs the voice to the outside, and converts the voice into voice data. The transmitter 27b is input to the voice processing unit 22.

  The SP (Speaker) 28 converts the sound signal input from the sound processing unit 22 into sound and outputs the sound to the outside.

[Conference System Operation]
Next, operations of the conference system according to the present embodiment will be described with reference to FIGS.

<Overall operation>
First, the overall operation of the conference system will be described with reference to FIG. In FIG. 4, a case where a conference call is started between the terminal devices 2a to 2d with the terminal device 2c as the center will be described as an example.

  When the terminal device 2c performs a conference call with the terminal devices 2a to 2d, the terminal device 2c sequentially holds the terminal devices 2a and 2b that perform the conference call (steps S1 and S2), and then does not hold the conference call among the participants of the conference call. A call is made with the last terminal device 2d (step S3). In this state, when the operation input unit 23 detects an operation input for requesting a conference call (step S4), the call control unit 26a of the control unit 26 requests the SIP server 3 for the conference call. A control signal (conference request) is transmitted (step S5).

  When receiving this control signal, the SIP server 3 responds to the request for the conference call and transmits a control signal (conference response) including the IP address of the conference server 1 to the terminal devices 2a to 2d (step). S6-S9). The SIP server 3 transmits a control signal (conference response) including the IP addresses of the terminal devices 2a to 2d to the conference server 1 (step S10).

  When receiving the control signal, the call control unit 26a of the terminal devices 2a to 2d forms a call path with the conference server 1 via the I / F unit 21, the network 4, and the I / F units 11a to 11c, respectively. Audio data is transmitted and received using the call path (steps S11 to S14). Thereby, the conference call between the terminal devices 2a to 2c is realized.

  Specifically, the audio signal input from the transmitter 27 b of the HS 27 of the terminal devices 2 a to 2 d is encoded into audio data by the audio processing unit 22, and the conference server via the I / F unit 21 and the network 4. 1 is transmitted. In the conference server 1, the audio data received from the terminal devices 2a to 2d is input to the editing processing unit 12 from the I / F units 11a to 11d corresponding to the terminal devices 2a to 2d, respectively. The unit 12 synthesizes the conference data consisting of one piece of audio data. The conference data is transmitted from the I / F units 11a to 11d to the corresponding terminal devices 2a to 2d, decoded by the voice processing unit 22 of each terminal device 2a to 2d, and output from the handset 27a of the HS 27. Thereby, the conference call between the terminal devices 2a to 2d using the HS 27 is realized (steps S15 to S18).

  The list generation unit 13b of the control unit 13 of the conference server 1 transmits the terminal device list to the terminal devices 2a to 2d (steps S19 to S22). This terminal device list includes information on the terminal devices 2a to 2d. Such a terminal device list is stored as the terminal device list 25b in the storage unit 25 of the terminal devices 2a to 2d.

  When receiving the terminal device list, the detection units 26b of the terminal devices 2a to 2d detect the terminal devices 2 participating in the conference call. Based on the detection result, the display control unit 26 c changes the display state of the display unit 24. For example, as shown in FIG. 5, the function keys 23a provided on the main body of the terminal device 2 and the terminal devices 2 listed in the terminal device list are associated with each other in a one-to-one correspondence, and are provided in the function keys 23a. Change the LED display. At this time, the correspondence between the function key 23a and the terminal device 2 may be displayed on the LCD 24a. Thereby, the user can easily recognize the correspondence between the function key 23a and the terminal device 2 participating in the conference call. The details of the display state of the LEDs provided on the function key 23a will be described later.

  Thus, in the state where one conference call is being performed at the terminal devices 2a to 2d, in order to end the conference call, the user of the terminal device 2d inputs an operation input for requesting the end of the call to the terminal device 2d. When the input unit 23 detects (step S31), the call control unit 26a of the control unit 26 of the terminal device 2d transmits a control signal (end call request) to end the conference call to the SIP server 3. (Step S32). Upon receiving this control signal, the SIP server 3 transmits a control signal (end request request response) indicating that the conference call with the terminal device 2d is ended to the conference server 1 (step S33). Then, the call path between the conference server 1 and the terminal device 2d is disconnected, and the conference call of the terminal device 2d is terminated (step S34).

  At this time, the display control unit 26c of the terminal device 2d changes the display state of the display unit 24. For example, the correspondence between the function key 23a shown in FIG. 5 and the terminal device 2 listed in the terminal device list is discarded, and the LED provided in each function key 23a is turned off. Thereby, the user can easily recognize that the conference call has ended.

  When the call path of the terminal device 2d is disconnected, the list generation unit 13b of the control unit 13 of the conference server 1 transmits the terminal device list to the terminal devices 2a to 2c (steps S35 to S37). This terminal device list includes information on the terminal devices 2a to 2c currently participating in the conference call.

  When the terminal device list is received, the detection units 26b of the terminal devices 2a to 2d compare the received terminal device list with the terminal device list received last time stored in the terminal device list 25b, and participate in the conference call. The terminal device 2 is detected. Based on the detection result, the display control unit 26c changes the display state of the display unit 24 (steps S38 to S40). For example, the correspondence between the function key 23a shown in FIG. 5 that is associated with the terminal device 2d and the terminal device 2d is discarded, and the LED of the function key 23a is turned off. Thereby, the users of the terminal devices 2a to 2c can easily recognize that the terminal device 2d has ended the conference call.

  As described above, according to the present embodiment, the list generation unit 13b of the control unit 13 of the conference server 1 starts the conference call, or the terminal device participating in the conference call ends the conference call. A terminal device list is generated according to a change in the number of terminal devices 2 participating in the conference call, and transmitted to the terminal devices 2 participating in the conference call. The terminal device 2 that has received the terminal device list detects the state of the other terminal device 2 participating in the conference call based on the terminal device list by the detection unit 26b, and the display control unit 26c based on the detection result. To change the display of the display unit 24. Thereby, the user of the terminal device 2 can easily identify the terminal device 2 participating in the conference call.

  In the present embodiment, even when the terminal device 2 newly participates in the conference call, the list generation unit 13b of the conference server 1 generates a terminal device list and uses this to participate in the conference call. It transmits to the terminal device 2. Thereby, the user of the terminal device 2 can easily recognize the terminal device 2 newly participating in the conference call.

  Further, for example, when all the other terminal devices participating in the conference call end the conference call, and the terminal device participating in the conference call becomes only the terminal device 2a, the conference server 1 The list generation unit 13 transmits to the terminal device 2a a terminal device list indicating that the terminal device 2 participating in the conference call is only the terminal device 2a. In this case, the terminal device 2a causes the detection unit 26b and the display control unit 26c to turn off the LED of the function key 23a associated with the other terminal device 2 participating in the conference call, for example. Thereby, the user of the terminal device 2a can recognize that the other terminal device 2 participating in the conference call has ended the conference call.

<Outgoing action>
Next, with reference to FIG. 6, a call operation during a conference call will be described. In FIG. 6, as an example, when a conference call is being performed between the terminal devices 2 a to 2 d, the terminal device 2 a makes a call to the terminal device 2 b in order to perform a separate call different from the conference call. The case where it does is demonstrated. In the following, an example will be described in which the terminal devices 2a to 2d are associated with the function keys 23a-1 to 23a-4 illustrated in FIG. 5 in this order.

  As described with reference to FIG. 4, when the control unit 26 of the terminal devices 2 a to 2 d receives the terminal device list from the conference server 1 along with the start of the conference call, the control unit 26 participates in the conference call by the detection unit 26 b. And the function key 23a of the operation input unit 23 is associated with the terminal device 2 participating in the conference call based on the detection result by the display unit control unit 26c. The display of the LED provided in is controlled. In the present embodiment, in the case of the terminal device 2a in a conference call, the display control unit 26c is in a state where the LED of the function key 23a-1 associated with itself is lit in green, and the terminal devices 2b to 2d are The LEDs of the function keys 23a-2 to 23a-4 that are associated with each other are in a state in which red is lit.

  In the terminal device 2a thus displayed, when the operation input unit 23 detects a hold operation such as a hold button being pressed (step S41), the call control unit 26a calls the conference server 1 Put the path on hold. This holding is performed, for example, by transmitting a silent packet to the conference server 1.

  After the hold operation, when a call operation such as pressing the function key 23a-2 assigned to the terminal device 2b is detected by the operation input unit 23 (step S42), the call control unit 26a displays the SIP server 3 To the terminal device 2b. When this transmission operation is detected, the display control unit 26c changes the display of the LED of the function key 23a-2 from a state in which red is lit to a state in which red is blinking slowly. Thereby, the user of the terminal device 2a can recognize that the transmission to the terminal device 2b is performed.

  When the terminal device 2b responds to this outgoing call operation (step S43: YES), the call control unit 26a of the terminal device 2a connects the terminal device 2b to the call path and transmits / receives voice data, thereby making a conference call. Separately, the terminal device 2b is individually talked (step S44). When an individual call is being made with the terminal device 2b, the display control unit 26c of the terminal device 2a maintains the LED display of the function key 23a-2 in a state where the red color blinks slowly.

  When making a separate call with the terminal device 2b during the conference call, the terminal devices 2a and 2b specify the output destination of the audio signal based on the conference data received from the conference server 1 by the audio processing unit 22 from the receiver 27a of the HS 27. While switching to SP28, a silence packet may be transmitted to the conference server 1. Thereby, the audio signal based on the conference data received from the conference server 1, that is, the audio of the conference call is output from the SP 28 of the terminal devices 2a and 2b. Moreover, the audio | voice data based on the audio | voice signal input into the transmitter 27b of HS27 of the terminal devices 2c and 2d are not output with respect to the conference server 1. FIG. Thereby, since the user of the terminal device 2a can hear the conference call, even if the user is talking individually with the terminal device 2b during the conference call, it is possible to follow the content of the conference call.

  At this time, the audio processor 22 sets the output destination of the audio signal based on the audio data received from the terminal device 2a or the terminal device 2b to the receiver 27a of the HS 27, and converts the audio signal input from the transmitter 27b of the HS 27 into the audio signal. You may make it transmit the audio | voice data based on the terminal device 2a or the terminal device 2b. Therefore, when an individual call is performed between the terminal device 2a and the terminal device 2b, a voice signal input from the transmitter 27b of the terminal device 2a is output from the receiver 27a of the terminal device 2b, and the terminal device The voice signal input from the 2b transmitter 27b is output from the receiver 27a of the terminal device 2a. Thereby, since the content of the individual call performed between the terminal device 2a and the terminal device 2b is not included in the conference call, it is possible to prevent the conference call from being disturbed.

  After the individual call is performed as described above, when the terminal device 2a or the terminal device 2b performs a call termination operation to end the individual call (step S45: YES), the terminal device 2a The call control unit 26a disconnects the call path with the terminal device 2b (step S46). As a result, the individual call with the terminal device 2b is ended. Thus, when the individual call is ended, the display control unit 26c of the terminal device 2a changes the display of the LED of the function key 23a-2 from a state in which red blinks slowly to a state in which red is lit. Thereby, the user of the terminal device 2a can recognize that the individual call with the terminal device 2b is ended.

  When the individual call ends and the operation input for returning to the conference call is detected by the operation input unit 23 (step S47: YES), the call control unit 26a of the terminal device 2a holds the conference server 1 on hold. Is canceled, and transmission / reception of audio data to / from the conference server 1 is resumed, thereby returning to the conference call (step S48).

  As described above, according to the present embodiment, the user of the terminal device 2 is participating in the conference call by changing the display of the function key 23a in accordance with the change in the call control state accompanying the outgoing operation. It is possible to know the state of the terminal device.

<Incoming call response action>
Next, an incoming call response operation during a conference call will be described with reference to FIG. In FIG. 7, as an example, when a conference call is being performed between the terminal devices 2a to 2d, the terminal device 2b receives an incoming call from the terminal device 2a that requests an individual call different from the conference call. The case will be described. In the following, an example will be described in which the terminal devices 2a to 2d are associated with the function keys 23a-1 to 23a-4 illustrated in FIG. 5 in this order. At this time, the display control unit 26c of the terminal device 2a during the conference call has the function key 23a-2 associated with the terminal device 2a, 2c, and 2d in green, with the LED of the function key 23a-2 associated with itself being green. -1, 3 and 4 LEDs display red.

  When an incoming call from the terminal device 2a is detected in the terminal device 2b displayed in this manner (step S51), the call control unit 26a displays a ring tone indicating that the incoming call has been received from the handset 27a of the HS 27. Output with voice based on data. At this time, the display control unit 26c of the terminal device 2b changes the display of the LED of the function key 23a-1 from a state in which red is lit to a state in which red is blinking quickly. Thereby, the user of the terminal device 2b can recognize that the incoming call has arrived from the terminal device 2a.

  When the operation input unit 23 detects an operation input for responding to an incoming call from the terminal device 2a, such as pressing the function key 23a-1, (step S52: YES), the call control unit 26a of the terminal device 2b is set to the terminal device 2a. In addition to the conference call, the call is individually made with the terminal device 2a by connecting the call path and the voice data (step S53). When responding to the incoming call in this way, the display control unit 26c changes the display of the LED of the function key 23a-1 from the state where the red blinks quickly to the state where the red blinks slowly. Thereby, the user of the terminal device 2b can recognize that an individual call with the terminal device 2a is being performed.

  When the terminal operation is performed by the terminal device 2a or the terminal device 2b (step S54: YES), the call control unit 26a of the terminal device 2b disconnects the call path with the terminal device 2a (step S55). As a result, the individual call with the terminal device 2a is ended. In this way, when the individual call is ended, the display control unit 26c of the terminal device 2b changes the display of the LED of the function key 23a-1 from a state in which red blinks slowly to a state in which red is lit. Thereby, the user of the terminal device 2b can identify that the individual call with the terminal device 2a is ended.

  When the individual call ends and the operation input unit 23 detects an operation input for returning to the conference call (step S56: YES), the call control unit 26a of the terminal device 2b holds the conference server 1 on hold. Is released, and transmission / reception of audio data to / from the conference server 1 is resumed, thereby returning to the conference call (step S57).

  Thus, according to this embodiment, the user of the terminal device 2 is participating in the conference call by changing the display of the function key 23a in accordance with the change in the call control state related to the incoming call response operation. It is possible to know the state of the terminal device.

  As described above, according to the present embodiment, the state of the terminal device 2 participating in the conference call is detected based on the terminal device list received from the conference server 1, and the detection result is displayed on the display unit. 2, the user of the terminal device 2 can know the state of the terminal device 2 participating in the conference call.

  In the present embodiment, the conference call is performed by the four terminal devices 2a to 2d. However, the number of the terminal devices participating in the conference call is not limited to four, and can be freely set as appropriate. it can.

  The present invention can be applied to a system and a terminal device that can simultaneously transmit and receive audio data to and from a plurality of devices.

It is a schematic diagram which shows the structure of the conference system which concerns on this invention. It is a block diagram which shows the structure of a conference server. It is a block diagram which shows the structure of a terminal device. It is a timing chart which shows the whole operation | movement of a conference system. 3 is a diagram illustrating an example of an operation input unit 23 and a display unit 24. FIG. It is a flowchart which shows the transmission operation | movement during a conference call. It is a flowchart which shows the incoming call response operation during a conference call.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Conference server, 2, 2a-2d ... Terminal device, 3 ... SIP server, 4 ... Network, 11a-11d ... I / F part, 11a-1-11d-1 ... Communication line, 12 ... Editing process part, 13 ... Control part, 13a ... Operation control part, 13b ... List generation part, 21 ... I / F part, 21a ... Communication line, 22 ... Audio processing part, 23 ... Operation input part, 23a, 23a-1 to 23a-4 ... Function keys, 24 ... display unit, 24a ... LCD, 25 ... storage unit, 25a ... control data, 25b ... terminal device list, 25c ... program, 26 ... control unit, 26a ... call control unit, 26b ... detection unit, 26c ... Display control unit, 27... HS, 27 a... Handset, 27 b.

Claims (5)

A plurality of terminal devices that transmit and receive audio data via a network; and a server device that edits the audio data received via the network and transmits the edited audio data to the network. A conference system for realizing a conference call in which the plurality of terminal devices participate by performing transmission and reception of audio data between the plurality of terminal devices and the server device,
The server device
A list generation unit that generates a terminal device list of terminal devices participating in one conference call;
An interface unit for transmitting the terminal device list to the terminal devices participating in the conference call,
The terminal device
A conference system comprising: a display control unit configured to display a terminal device participating in the conference call on a display device based on the terminal device list received from the server device. The conference system according to claim 1, wherein the list generation unit generates the terminal device list when the number of terminal devices participating in the conference call changes. The terminal device
A plurality of operation detection devices that detect user operation inputs relating to call control; and the display device is provided for each of the operation detection devices,
The conference system according to claim 1, wherein the display control unit associates the display device with each terminal device participating in the conference call. The terminal device
A call control unit for controlling a call with a terminal device participating in the same conference call;
The said display control part controls the display of the said display apparatus according to the state of call control with the terminal device which participates in the said conference call. The one of the Claims 1 thru | or 3 characterized by the above-mentioned. Conference system. A terminal device of a conference system that realizes a conference call in which the plurality of terminal devices participate by performing transmission and reception of audio data between the plurality of terminal devices and the server device via a network,
A display unit configured to display a terminal device participating in the conference call on a display device based on a terminal device list relating to the terminal device participating in the conference call received via the network; Terminal device.

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