KR100824734B1 - Method for transmitting data on multi-call communication environment and system thereof - Google Patents

Abstract

A method for transmitting data in a multi-call communication environment and a system thereof are provided to identify a caller by transmitting images simultaneously during multiple call requests, and improves conversation quality by offering data simultaneously during a call. A method for transmitting data in a multi-call communication environment comprises the following steps of: allowing a calling terminal to select at least one called terminal if an image capable of displaying a caller is generated in the calling terminal, and to transmit the image including the unique call identifier of the calling terminal to the selected called terminal according to a state of the called terminal by using an options method(210,220); allowing the calling terminal to transmit a call request message including the unique call identifier of the calling terminal to the called terminal by using an invite method if the response message of the called terminal is received according to the image transmission of the calling terminal(230); displaying the received image on the called terminal when the unique call identifier of the calling terminal included in the transmitted call request message is identical with an unique call identifier included in the image(240); and allowing the called terminal to accept the call request and participate in a conversation(250).

Description

Method for transmitting data on multi-call communication environment and system

1 illustrates a data transmission system in a multi-call communication environment of the present invention.

2 is a flowchart illustrating a data transmission method in a multi-call call environment according to an embodiment of the present invention.

3 is a flowchart illustrating a data transmission method in a multi-call call environment according to another embodiment of the present invention.

4 is an example of a message of an option method applied to the present invention.

5 is an example of a message of the invite method applied to the present invention.

6 is an example of a message of a message method applied to the present invention.

The present invention relates to a data transmission method and system therefor in a multi-call communication environment, and more particularly, to a data transmission method and system in a multi-call communication environment in an IP-based 1: n call.

With the recent development of mobile communication technology, when making a call using a wireless terminal, a call can be requested and data can be transmitted and received based on IP. Further, based on IP technology, services for transmitting and receiving packet data as well as during a call continue to be developed.

Looking at the conventional mobile communication services, Caller IDentification presentation supplementary service (CID) to display the caller's call number when making a call, a ring back tone service to send instead of the dial tone, additional data services other than phone calls In addition, in recent years, the area of broadcasting reception services has been diversified.

The caller ID service simply displays the caller's number on the receiver's screen, or it is a simple service that transmits the sender's message, allowing IP-based packet data transmission and sending an image when a phone call becomes larger. In addition, additional data services include mobile banking, services connecting to the existing Internet, or messenger interworking services. Recently, the utilization of such terrestrial DMB phones has been increasing.

In recent years, by linking IP networks with rich services using wireless mobile terminals, standard activities to support various services are centered on 3rd Generation Partnership Project (3GPP), which is the 3rd generation mobile communication European standard. It is actively done. This is called IP Multimedia Subsystem (IMS), and the standard mainly defines which servers can be connected between different terminals. In other words, it defines what components are needed and in what order the IP network can be connected.

However, since a telephone call using a data transmission system is a one-to-one call in a conventional IP-based call environment, the provided service itself tends to be limited to a one-to-one service. Since the service is not provided separately, it is not possible to provide a packet service during a phone call, and the server must be always connected to the call.

Accordingly, the first technical problem to be achieved by the present invention is to provide a data transmission method in an IP-based multicall communication environment capable of providing a packet data transmission service during a multicall call.

The second technical problem to be achieved by the present invention is to provide a data transmission system in an IP-based multi-call call environment using the data transmission method in the IP-based multi-call call environment.

The present invention to achieve the first technical problem,

When an image capable of displaying a caller is generated at the originating terminal, at least one or more receiving terminals are selected from the originating terminal on which the image is generated, and an option method is applied to the selected receiving terminal. Transmitting an image including a call identifier unique to the caller terminal according to the state of the receiver terminal, receiving a response message of the receiver terminal according to the image transmission from the caller terminal, and assigning a call identifier unique to the caller terminal. Transmitting the included call request message to the receiving terminal by using an invite method, and when the call identifier unique to the calling terminal included in the transmitted call request message and the unique call identifier included in the image are the same, And displaying the received image on the receiving terminal, and accepting the call request at the receiving terminal to participate in a call.

The present invention to achieve the first technical problem,

Compressing data stored in the calling terminal while transmitting telephone voice to a plurality of receiving terminals in the calling terminal, and transmitting information on the data to at least one receiving terminal using a message method using a message method, wherein the calling terminal Receiving a response message of the receiving terminal according to the information on the data, transmitting data including a call identifier unique to the calling terminal to the receiving terminal, storing the received data at the receiving terminal, Displaying information of stored data on the receiving terminal, and receiving completion of the data from the receiving terminal and storing whether the data is successfully transmitted to the calling terminal; Provide a transmission method.

The present invention to achieve the second technical problem,

In a data transmission system in a multi-call call environment including a calling terminal and a plurality of receiving terminals transmitting data based on a session initiation protocol, the calling terminal generates an image for generating an image capable of displaying the caller itself. The control unit selects at least one or more receiving terminals from the calling terminal in which the image is generated, determines a state of the selected receiving terminal, and selects a receiving terminal to which the calling terminal transmits data during a call; an image displaying the calling terminal. Transmits to the selected receiving terminal, receives a response message of the receiving terminal according to the image transmission, transmits a call request message of the calling terminal, and at least one receiving terminal for information on data to be transmitted from the calling terminal during a call. In accordance with the information about the data And a multi-call transceiving unit for transmitting the data after receiving a response message from a receiving terminal, and a data generating unit for generating data to be transmitted during the call, wherein the receiving terminal includes the call identifier unique to the calling terminal. Receives an image, transmits a response message of the receiving terminal to the received image, receives data including a call identifier unique to the calling terminal, and a response message of the receiving terminal according to the information on the received data A multi-call transmitting / receiving unit for transmitting a call, a control unit for determining whether to accept the call request and data transmission of the calling terminal, and a display unit for displaying the received image or data; to provide.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, but the present invention is not limited thereto.

However, embodiments of the present invention illustrated below may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. Embodiments of the invention are provided to more fully illustrate the invention to those skilled in the art.

1 illustrates a data transmission system in a multi-call communication environment of the present invention.

Referring to Figure 1, the originating terminal 100 of the data transmission system in the multi-call call environment of the present invention is the image generating unit 101, the control unit 102, multi-call transmitting and receiving unit 103 and the data generating unit 104 ), And the plurality of receiving terminals 110 to 190 may include a multi-call transmitting / receiving unit 111 to 191, a control unit 112 to 192, and a display unit 113 to 193.

The image generating unit 101 of the calling terminal generates an image capable of displaying the calling party. The image generator 101 may generate an image indicating the caller when the calling terminal is in a standby state, and the generated image may be stored and used continuously, and a specific image may be selected from the calling terminal from among the stored images.

The data generator 102 of the calling terminal generates data to be transmitted to the receiving terminal during the call and transmits the data to the controller 103.

The controller 103 of the calling terminal selects at least one or more receiving terminals from the calling terminal that has generated the image from the image generator 101, and determines the state of the selected receiving terminal. In addition, when data is to be transmitted during a call, a receiving terminal to which data generated by the calling terminal is to be selected is selected.

More specifically, the control unit 103 of the calling terminal may store a data list of the data to be transmitted if the data is to be transmitted to the receiving terminal during the call. The controller 103 of the calling terminal compares the response message transmitted after receiving data from the receiving terminals 110 to 190 using the data list and the data generated by the calling terminal. In this way, it is possible to determine whether the correct data is transmitted from the originating terminal 100 to the receiving terminals 110 to 190.

The multi-call transmitting and receiving unit 104 of the calling terminal transmits an image representing the caller to the selected receiving terminal. This image creates a session initiation protocol for each of the selected receiving terminals. In addition, according to the call progress, an option method is first created to compress and add an image representing the caller to the body of the method. After that, when the response message '200 OK' is received from the receiving terminal, a call request is made to the receiving terminal using an invite method, which is the next step of the call, and the receiving terminal '183 session', '180 ringing', If the message '200 OK' is normally received, a normal call is transmitted by sending a response message.

During a call, the multi-call transmitting and receiving unit 104 of the calling terminal transmits information on data to be transmitted from the calling terminal to at least one receiving terminal, and after receiving a response message of the receiving terminal according to the information on the data, receives the data. Send to the receiving terminal.

In addition, during a call, the multi-call transmitting and receiving unit 104 of the originating terminal transmits a message to be transmitted in the session initiation protocol stack to the receiving terminal using a transmission control protocol or a user datagram protocol network.

In addition, referring to Figure 1, the multi-call transmitting and receiving unit (111 to 191) of the receiving terminal (110 to 190) of the data transmission system in the multi-call call environment of the present invention receives the image including the caller-specific identifier, The response message of the receiving terminal with respect to the received image is transmitted to the multi-call transmitting and receiving unit 104 of the calling terminal.

During the call, the receiver receives data including a caller-specific identifier, and transmits a response message of the receiving terminal according to the information on the received data to the multi-call transmitting and receiving unit 104 of the calling terminal.

The controllers 112 to 192 of the receiving terminals 110 to 190 determine whether to accept the call request or the data transmission of the calling terminal and transmit them to the multi-call transmitting and receiving units 111 to 191 of the receiving terminal.

In addition, the display units 113 to 193 of the receiving terminals 110 to 190 display the received image or data on the receiving terminal.

Since the present invention is a data transmission system in a multi-call communication environment without using a server, the present invention can be applied to an ad hoc environment in the same manner.

2 is a flowchart illustrating a data transmission method in a multi-call call environment according to an embodiment of the present invention.

The session initiation protocol is the most widely used protocol for easy connection and disconnection between terminals in a packet network, and is the specification of the IP Multimedia Subsystem (IMS) of the 3rd Generation Partnership Project (3GPP). It is also used for CDMA packet-based video communications.

In case of making a call by connecting session based on session initiation protocol, IP-based communication is performed. Then, the data is filled with the session initiation protocol, the transmission protocol is selected through the Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP), and the data is transmitted through the lowest IP layer. Can transmit

The Options method detects the user agent (UA), that is, the data capacity of the receiving terminal, adjusts the state of data to be transmitted, and establishes a session between the calling terminal and the receiving terminal or between the calling terminal and the server. It is a method for performing negotiation between them.

The function of the Options method is to check how well the proxy server or receiving terminal supports the incoming connection. Here, the support capability may include a method supported by the receiving terminal, a type of data that can be supported, an extension, a codec, and the like. In this way, the state of the receiving terminal can be grasped in advance before transmitting data from the calling terminal. After that, since the originating terminal only needs to receive a response of '200 OK' from the receiving terminal, it does not affect any call connection process that proceeds thereafter.

Referring to FIG. 2, first, an image capable of displaying a caller in a calling terminal is generated (step 210).

The calling terminal selects an image representing the caller and compresses it. Compression methods include packing, squeezing, crunching, or squashing, and all of the devices that can be supported by the device, such as JPG, JPEG, GIF, and BMP. It may include a format.

Next, at least one receiving terminal is selected from the originating terminal in which the image is generated, and an image including a call identifier unique to the originating terminal is selected according to the state of the receiving terminal using the OPTIONS METHOD for the selected receiving terminal. In step 220, it transmits to the receiving terminal.

It can transmit packet-based data using Session Initiation Protocol (SIP), which is in charge of establishing and releasing sessions for sending and receiving connection information before the actual call is connected.

The transmission control protocol network continues to transmit until an ACK message is received for all the transmitted data so that transmission data is surely transmitted between the two terminals. On the other hand, the user datagram protocol places a heavy emphasis on data transmission to ensure high speed.

Using the transmission control protocol network, it is possible to guarantee that the transmitted data arrives at the receiving terminal, but it is not suitable for real time communication because retransmission must be performed for the data that failed to be transmitted.

In case of using user datagram protocol network, it does not guarantee whether the transmission data has arrived at the originating terminal, but it is suitable for real time communication because there is no retransmission.

In this environment, the IP network, the protocol of the lowest network network, cuts and transmits data in a WCDMA network environment. That is, when data is transmitted when the data to be transmitted is larger than a predetermined size, it means that the data is cut in a predetermined unit in the IP transmission step.

In this case, when data is transmitted using the user datagram protocol network, if the data to be transmitted is greater than or equal to a certain size, the data may be truncated and transmitted from the IP network, and not all of the truncated data may be transmitted to the receiving terminal. Therefore, when transmitting arbitrary data in the session initiation protocol network, there is a need to transmit data in units of a predetermined size or less.

Meanwhile, the size of data to be transmitted may be 1500 bytes or less. If the size of the data to be transmitted is 1500 bytes or more, the packet is cut into 1500 byte units and transmitted.

In order to perform a multicall based on the session initiation protocol, an option method of the session initiation protocol may be used, and the terminal may manage the multicall list. Then, the multi-call is established with the receiving terminal with a response within a certain time. At this time, the caller who calls can send information about who made the call, that is, a call identifier, not just a call request.

Preferably, in the step 220 of transmitting the image including the caller's unique call identifier to the selected receiving terminal, the image data is transmitted to the receiving terminal by applying the options method, and the response message transmitted from the receiving terminal is checked. can do.

If the data transmitted from the calling terminal and the data received at the receiving terminal are not the same, the receiving terminal deletes the transmitted data and retransmits the image again at the calling terminal. have. Then, the error of the image data transmitted from the originating terminal does not occur.

On the other hand, Calling ID (Calling ID) (Calling-ID) is a session initiation protocol message header, the ID assigned to the message. Therefore, the call identifier assigned to each message must be unique.

Thereafter, the originating terminal receives the response message of the receiving terminal according to the image transmission, and transmits the call request message including the caller's unique call identifier to the receiving terminal using the invite method (step 230).

In the session initiation protocol, parameters of the header may be adjusted accordingly to transmit one or more data including a call identifier using an invite method without using a service server.

However, if the size of the data to be transmitted is large, the size of the session initiation protocol message exceeds 1500 bytes. In this case, the size of the data to be transmitted is determined in step 220 of applying the optional method.

If the size of the data to be transmitted exceeds 1500 bytes, the data can be transmitted using the transmission control protocol. If the size of the data is less than 1500 bytes, the data can be transmitted to the receiving terminal using the user datagram protocol. .

If you send an image that contains a call identifier in this way, you won't be able to interpret the entire message because some of the truncated data isn't sent.

Next, when the caller's unique call identifier included in the transmitted invite method and the unique call identifier included in the transmitted image are the same, the received image is displayed on the receiving terminal (step 240).

When data is transmitted using the options method (step 220), the data is transmitted including the call identifier, and the originating terminal receives a response of '200 OK' from the receiving terminal. Next, if an invite method having the same call identifier as the call identifier included in the image is transmitted when the image is transmitted using the options method (step 130), the image transmitted using the options method is transmitted to the receiving terminal. Display.

In this case, 180 ringing is performed according to the call request message of the calling terminal, and according to 180 ringing, the receiving terminal decodes the received image data and displays the decoded image on the receiving terminal.

Finally, the receiving terminal accepts the call request to participate in the call (250).

The calling terminal can be determined from the image displayed on the receiving terminal, and if the caller wants to talk with the caller, the call request is accepted to join the call.

That is, when a 1: n multicall is performed using the session initiation protocol, when a call is made, an image selected directly by the originating terminal is transmitted to a plurality of receiving terminals, and the receiving terminal originates from the sender's unique call identifier. After identifying the terminal and receiving the image, the image can be confirmed.

On the other hand, since the present invention is a data transmission method in a multi-call call environment without using a server, it can be applied to the ad hoc environment in the same manner.

3 is a flowchart illustrating a data transmission method in a multi-call call environment according to another embodiment of the present invention.

Referring to FIG. 3, first, the calling terminal compresses data to be transmitted during transmission of telephone voices with a plurality of receiving terminals, and stores information on the data to be transmitted using the message method to at least one receiving terminal using the message method. Transmit (step 310).

It compresses and transmits data to transmit at least one receiving terminal from at least one calling terminal in a multicall phone call, that is, a picture, an image, a video, or a sound, using a session initiation protocol. It is.

When there is data to be transmitted while transmitting telephone voice with a plurality of receiving terminals, the calling terminal compresses the data to be transmitted once, and then informs the receiving terminals of information about the data to be transmitted by using a message method during a call. .

Information about the data to be transmitted includes a message indicating that there is data to be transmitted and characteristics of the data to be transmitted.

Therefore, the caller notifies the plurality of receiving terminals in the call that there is data to be transmitted by using the calling terminal, and also transmits information on characteristics of the data including information such as a channel to be transmitted, a type of data or a compression codec.

That is, the message method is a method of transmitting a message about what data is transmitted to which port and what is a compression codec to a plurality of receiving terminals.

Thereafter, the originating terminal receives the response message of the receiving terminal according to the information on the data, and transmits data including the caller's unique call identifier to the receiving terminal (step 320).

When a receiving terminal receives information on data to be transmitted according to a message method through a session connected during a call, the receiving terminal analyzes the received message and knows what data will be transmitted to which port in the future.

Then, the receiving terminal grasps information indicating that the calling terminal is sending data by the caller's unique call identifier.

When receiving data to be transmitted from among the receiving terminal, the '200 OK' message is transmitted to the calling terminal by using the receiving terminal, and when not wanting to receive the data, 'Error' message is transmitted. The terminal capable of receiving transmits a 200 OK message to the calling terminal and prepares to receive data.

The originating terminal directly transmits the pre-compressed data using the designated port to the receiving terminal which sent the response message indicating that reception is possible.

More specifically, the step of transmitting the data to the receiving terminal may include the step of transmitting using at least one of the transmission control protocol or the user datagram protocol.

For example, if the data transmission speed is required rather than the accuracy of data transmitted during a call, the data may be transmitted using a user datagram protocol network. In addition, when more accurate data transmission is required than rapid data transmission during a call, data may be transmitted using a transmission control protocol network.

Further, in the process of transmitting data to the receiving terminal, the information of the response message transmitted from the receiving terminal is determined, and if the data transmitted from the calling terminal and the data received from the receiving terminal are not the same, the receiving terminal transmits the data. Delete and resend the image from the calling terminal again. Then, the error of the image data transmitted from the originating terminal does not occur.

Next, the data received by the receiver terminal of the receiver is stored, and information on the stored data is displayed on the receiver terminal (step 330).

The receiving terminal to receive data transmission stores the data received by the receiving terminal, and analyzes the information of the transmitted data and displays the information on the receiving terminal, whereby the receiver can grasp the information of the data transmitted from the receiving terminal.

Finally, the originating terminal receives the completion of the reception of the data from the receiving terminal and stores whether the data is successfully transmitted to the originating terminal (step 340).

In addition, the originating terminal manages the list of the recipients who have received the data, thereby checking whether the data has been transmitted to the receiving terminal that has received the data. Then, it is possible to check whether or not the data transmission error to the receiving terminal that has not yet been transmitted.

Similarly, since the present invention is a data transmission method in a multi-call call environment without using a server, the present invention can of course also be applied to an ad hoc environment.

4 is an example of a message of an option method applied to the present invention.

Referring to FIG. 4, an example of a header and a body included in a message of an options method is shown.

In the header of the options method, the caller's unique call identifier, data size, data type, and address of the calling terminal and the receiving terminal are displayed. The body of the Options method contains the actual data to be sent.

Referring to FIG. 4, an ID of a calling terminal to which data is to be transmitted is wisenote, and a 827 byte JPEG image is transmitted to a receiving terminal having an ID of Movinote through a path of 150.150.82.26 using a user datagram protocol. It can be seen.

Based on this information, the calling terminal transmits data to the receiving terminal, and when a '200 OK' message arrives from the receiving terminal, the calling terminal transmits a call request message using an invite method.

5 is an example of a message of the invite method applied to the present invention.

Referring to FIG. 5, it can be seen that the body of the invite method includes a session description protocol (SDP), which means a multimedia session and related schedule information.

The header meaning this is a content-type, which is the same as content-type: application / sdp in FIG. 4. This means that the body of the byte method is not empty, and the body type is the session description protocol type in the application.

In this content, if there are two or more different types of body contents and want to distinguish the contents, the content type can be defined as 'multipart / mixed'.

Multipart means that there is more than one different data in one body. Each data is divided into delimiter lines, and the media data is also finished. Each body is separated into a header, a blank line, and a data body area that describes the content of the content.

Therefore, during the call, use the message method to open the text and any port to transmit data, and to send the session description protocol of what the codec is and what the data rate is, simultaneously to 'Content-type: multipart / mixed'. Can be described.

6 is an example of a message of a message method applied to the present invention.

When describing the content type as 'Content-type: multipart / mixed' as shown in FIG. 5, since two or more different types of bodies are included in the message body of the session initiation protocol, different types of bodies are separated from each other. It is necessary to insert a partition line. There is a restriction on the parcel line, which must be different from the content on the inserted body.

Referring to FIG. 6, a text including a message to be sent and a data to be sent to a channel by using a compression codec are included together. The partition line for separating the two data is designated as 'outer'. Doing. This corresponds to an example and can be variously designated according to a user.

On the other hand, when the partition line is designated as 'outer', the data of the text data and the channel setup information may not include the data 'outer'.

If the content type is 'multipart / mixed', there are two or more bodies, and each body has separate headers describing the content of the content. That is, the text data has a content type of 'text / plane'.

In addition, information on the nature and channel number of the data to be transmitted has a content type of 'application / x-whatever', and the contents expressed in the body should be promised to each other between the sender and the receiver. The content expressed in the body does not conform to a specific standard, and can be expressed according to an appointment between the calling terminal and the receiving terminal. In an example of the present invention, 'x-whatever' is used as a subtype of a content type. Doing.

The partition line specifies the division of the divided data. In one example of the present invention, when the '--outer' part appears by applying the specified 'outer', it is possible to know that the body is divided. And, at the end of the body, 'outer' is used to insert '--outer--' to indicate the end of the whole body.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical details of the appended claims.

As described above, according to the present invention, it is possible to simultaneously provide proof of the caller by simultaneously transmitting an image at the time of 1: n call request, and simultaneously provide data at the time of a phone call, thereby providing a call environment and a non-call. By not dividing the environment, the call quality can be improved, and even when the call volume increases, it is possible to provide a high quality data service without putting a load on the server during data transmission.

Claims (11)

When an image capable of displaying a caller is generated in the calling terminal, at least one receiving terminal is selected from the calling terminal in which the image is generated, and an option method is used for the selected receiving terminal. Transmitting an image including a call identifier unique to the calling terminal according to the state of the receiving terminal; When the response message of the receiving terminal according to the image transmission is received by the calling terminal, transmitting a call request message including a unique call identifier of the calling terminal to the receiving terminal using an invite method; And Displaying the received image on the receiving terminal when a call identifier unique to the calling terminal included in the transmitted call request message is identical to a unique call identifier included in the image; And And accepting the call request at the receiving terminal to participate in a call. The method of claim 1, The step of transmitting the image, And transmitting the image to the selected receiving terminal using at least one of a transmission control protocol network and a user datagram protocol network. The method of claim 2, The step of transmitting the image, Receiving a response message of the receiving terminal according to the transmission of the image; And And retransmitting the image when there is an error in the transmission of the image according to the response message. The method of claim 1, And the call request message is transmitted using a session initiation protocol. The method of claim 1, Displaying on the receiving terminal, Performing 180 ringing according to the call request message of the calling terminal; Decoding the received image according to the 180 ringing; And And displaying the decoded image on the receiving terminal. Compressing data stored in the calling terminal while transmitting telephone voice to a plurality of receiving terminals in the calling terminal, and transmitting information on the data to at least one receiving terminal by using a message method; When the response message of the receiving terminal according to the information on the data is received by the calling terminal, transmitting data including a call identifier unique to the calling terminal to the receiving terminal; Storing the received data at the receiving terminal and displaying the information of the stored data on the receiving terminal; And And receiving the completion of reception of the data from the receiving terminal and storing whether the data is successfully transmitted to the calling terminal. The method of claim 6, Information about the data, And at least one of a channel to be transmitted, a type of data, a compression codec, a size of data, and a port number to be used for data use. The method of claim 6, The step of transmitting the data to the receiving terminal, And transmitting the data using at least one of a transmission control protocol and a user datagram protocol. The method of claim 8, The step of transmitting the data to the receiving terminal, Receiving a response message of a receiving terminal according to the data transmission; And And retransmitting the data if there is an error in the data transmission according to the response message. In the data transmission system in a multi-call call environment comprising a source terminal and a plurality of receiving terminals for transmitting data based on the session initiation protocol, The calling terminal, An image generator for generating an image capable of displaying the caller himself / herself; A controller for selecting at least one or more receiving terminals from the originating terminal in which the image is generated, determining a state of the selected receiving terminal, and selecting a receiving terminal to which the calling terminal transmits data during a call; Transmitting an image indicating the calling terminal to the selected receiving terminal, receiving a response message of the receiving terminal according to the image transmission, transmitting a call request message of the calling terminal, and transmitting data to the calling terminal during a call. A multi-call transmitting / receiving unit which transmits information to at least one receiving terminal and transmits the data after receiving a response message of the receiving terminal according to the information about the data; And And a data generator for generating data to be transmitted during the call. The receiving terminal, Receiving the image including the call terminal unique call identifier, transmitting a response message of the receiving terminal to the received image, receiving data including the call identifier unique to the calling terminal, and receiving the data into the received data. A multi-call transceiving unit for transmitting a response message of the receiving terminal according to the information; A controller for determining whether to accept the call request and data transmission of the calling terminal; And And a display unit for displaying the received image or data. The method of claim 10, The control unit of the calling terminal, And a data list of data to be transmitted to the receiving terminal during a call.

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