KR20140018068A - Video chatting method, terminal device and video chatting system - Google Patents

Abstract

Disclosed are a video chatting method, a terminal device, and a video chatting system. Wherein, the video chatting method includes the steps of: transmitting and receiving a video stream between a transmitting terminal and a receiving terminal through a first communication channel; transmitting and receiving text data between the transmitting terminal and the receiving terminal through a second communication channel; and outputting a video chatting screen including the video stream and the text data by the transmitting terminal. [Reference numerals] (S201,S203) Transfer a Byte SM Es(INVITE SMS) message; (S205) Transfer a trying message; (S207) Video chatting session log record; (S209) 1 acceptable? Or 2. Rejected?; (S211,S213) Transfer an accept SM(OK SMS) message; (S215,S221) Transfer a session joining message; (S217) Check video chatting session log; (S219) Transfer a response(OK) message(including a sending terminal IP address); (S223) Transfer a response(OK) message(including a receiving terminal IP address); (S225) Establish a video chatting session; (S227) Transmit video stream through a data channel; (S229) Transmit texts through an SMS channel; (S231,S233) Transfer a canceling SMS message; (S235) Transfer a cancelling message; (S237) Remove a video chatting session log; (S239) Transfer the response(OK) message; (S241) Cancel the video chatting session

Description

VIDEO CHATTING METHOD, TERMINAL DEVICE AND VIDEO CHATTING SYSTEM}

The present invention relates to a video chat method, a terminal device and a video chat system.

3G multimedia communication method The portable terminal selects a voice signal, a text signal, and a video signal to communicate with a wirelessly connected party in two directions. There are two methods of real time connection and a non-real time communication method. .

Such a message type includes a voice message (VMS), a text message (SMS) and a video message (MMS), and temporarily stores message data to be transmitted to a message center or a message server and transmits the message data to a counterpart through a set communication path.

Also, as a method of transmitting a message during a video call to a portable terminal, i.e., a real time communication without using a server, a method of image-processing text of a text message and adding it to a video signal is known.

However, as a simpler and more economical method, there is a need to develop a technique for processing text and images simultaneously.

On the other hand, short message service (SMS), which has sustained high growth over the past few years, has recently been slowing down thanks to text conversation applications such as KakaoTalk.

Thus, mobile operators need to expand and differentiate their services as a way to overcome the continued decline in SMS average revenue. In other words, there is a demand for a method of generating additional revenue flow through the development of a service using SMS.

Therefore, the present invention is to provide a video chat method, a terminal device and a video chat system through the SMS (SMS) function.

According to one aspect of the present invention, a video chat method includes: transmitting and receiving a video stream by a calling terminal through a first communication channel; Transmitting / receiving text data by the calling terminal to and from the called terminal through a second communication channel different from the first communication channel; And outputting, by the calling terminal, a video chat screen including the video stream and the text data.

In this case, the first communication channel includes a communication channel for implementing a communication service according to a packet switched method based on an IP (Internet Protocol),

The second communication channel may include a communication channel in which a communication service according to a circuit switched method is implemented.

In addition, the second communication channel may include a short message service (SMS) channel.

Further, before the step of transmitting and receiving the video stream, the calling terminal further comprises the step of establishing a video chat session by exchanging SMS messages requesting and accepting video chat with the called terminal,

In the outputting, the video chat screen may be configured based on the data stream and the text data transmitted / received with a called terminal having the video chat session established.

In addition, the step of establishing,

Transmitting, by the calling terminal, an INVITE SMS message requesting a video chat to the called terminal; Notifying, by the calling terminal, that the INVITE SMS message is transmitted to a video chat server; Receiving, by the calling terminal, an Accept SMS message that accepts a video chat from the called terminal; Obtaining IP information of the called terminal from the video chat server; And establishing a video chat session with the called terminal.

Transmitting and receiving the video stream,

And transmitting and receiving the video stream through the first communication channel using IP information of the called terminal.

In addition, the INVITE SMS message,

It may include a method parameter set to an byte, a calling number parameter containing the telephone number of the calling terminal and a called number parameter containing the telephone number of the called terminal.

In addition, the step of transmitting the invite SMS message to the called terminal,

When the calling terminal detects a user input signal for selecting any one of a video chat menu provided on an SMS application screen, a video chat menu provided on a phone book, and a video chat menu provided on an SMS message screen, And transmitting the INVITE SMS message.

In addition, obtaining the IP information,

Transmitting, by the calling terminal, a session join message packet to the video chat server when the OK SMS message is received; And receiving an OK message packet including the IP address of the called terminal from the video chat server.

The called terminal may receive a response message packet including an IP address of the calling terminal by transmitting a session join message packet to the video chat server.

In addition, the step of transmitting and receiving the video stream,

When the IP information of the called terminal is a public IP type, transmitting and receiving a data stream directly with the called terminal; And when the IP information of the called terminal is a private IP type, transmitting and receiving a data stream relayed by the video chat server with the called terminal.

In addition, the step of transmitting and receiving the direct data stream,

The originating terminal may include transmitting and receiving the direct data stream with the called terminal using a hyper text transfer protocol (HTTP).

In addition, the step of transmitting and receiving the relaying data stream with the called terminal,

The originating terminal may include transmitting and receiving the relaying data stream with the called terminal using a network address translation protocol.

The method may further include transmitting, by the calling terminal, voice data to and from the called terminal through a first communication channel, and outputting the voice data through a speaker.

According to another aspect of the present invention, a terminal apparatus includes a video stream transmitting and receiving with a counterpart terminal through a first communication channel and text data transmitting and receiving with the counterpart terminal through a second communication channel different from the first communication channel. A video chat controller configured to configure the video chat screen; And a display unit for outputting the video chat screen.

At this time, further includes a memory for storing the Short Message Service (SMS) application,

The first communication channel is a communication channel for implementing a communication service according to the packet switched (Packet Switched) method based on the Internet Protocol (IP), the second communication channel is an SM channel,

The video chat control unit,

In response to a user's input signal, the SMS application is executed to exchange SMS messages for requesting and accepting a video chat with the counterpart terminal, and IP information of the counterpart terminal to be used in the first communication channel. Can be obtained from the video chat server to establish a video chat session.

In addition, the SMS application,

It may include a default application that is installed at the time of manufacture.

In addition, the SMS application,

It may include a smartphone application that can be downloaded and installed from a server connected to the network.

In addition, the video chat control unit,

After sending INVITE SMS requesting a video chat to the counterpart terminal, notifying the video chat server to transmit the INVITE SMS message, and accepting the video chat from the counterpart terminal. Upon receipt of an SMS message, a cancellation SMS message for acquiring IP information of the counterpart terminal from the video chat server to establish the video chat session, and rejecting the video chat from the counterpart terminal. Is received, transmitting a CANCEL message packet notifying the video chat server of the cancellation of the video chat session and receiving an OK message packet may cancel the establishment of the video chat session.

In a video chat system according to another aspect of the present invention, a video chat session is established between a calling terminal and a called terminal through a data channel, and text data is transmitted and received through an SMS (Short Message Service) channel. A video chat server to relay the video chat server; And an SMS server for transmitting an SMS message including text data transmitted and received between the calling terminal and the called terminal.

At this time, the video chat server,

A session received from the originating terminal by receiving a TRYING message packet notifying that the originating terminal transmits an INVITE SMS message requesting a video chat to the called terminal; In response to a JOIN message packet, a response message packet including IP information of the calling terminal to be used in the data channel is transmitted, and a response to the session join message packet transmitted by the calling terminal. In this case, an OK message packet including IP information of the called terminal to be used in the data channel may be transmitted.

In addition, the video chat server,

When the IP information of the calling terminal and the IP information of the called terminal are a private IP type, the data stream may be relayed between the calling terminal and the called terminal using a network address translation technique.

In addition, the video chat server,

After receiving the TRYING message packet from the originating terminal, if a CANCEL message packet according to the rejection of the video chat session of the called terminal is received, an OK message packet may be transmitted.

In addition, the SMS server,

The INVITE SMS message, the accept SMS message accepting the video chat transmitted by the called terminal, and the cancel SMS message rejecting the video chat may be delivered.

According to an embodiment of the present invention, by switching the transmission and reception of the SMS (SMS) to the video mode, by displaying the content of the text message overlaid on the video image when the SMS message is received after the conversion, the user You can video chat while viewing the contents of the text message. Therefore, video chatting can be performed in a simple manner without using a video call function using expensive communication resources.

1 is a block diagram of a video chat system according to an embodiment of the present invention.
2 is a block diagram showing the configuration of a terminal apparatus according to an embodiment of the present invention.
3 is a flowchart illustrating an operation of the terminal device of FIG. 2.
4 is an exemplary view of a video chat selection screen according to an embodiment of the present invention.
5 is an exemplary view of a video chat selection screen according to another embodiment of the present invention.
6 is an exemplary view of a video chat selection screen according to another embodiment of the present invention.
7 is an exemplary view of a video chat screen according to an embodiment of the present invention.
8 is an exemplary view of a video chat screen according to another embodiment of the present invention.
9 is a flowchart illustrating a video chat method according to an embodiment of the present invention.
10 is a diagram illustrating a screen of a called terminal according to an embodiment of the present invention.
11 is a flowchart illustrating a video stream transmission process according to an embodiment of the present invention.
12 is a flowchart illustrating a video stream transmission process according to another embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Also, the term "part" in the description means a unit for processing at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software.

Hereinafter, a video chat method, a terminal device, and a video chat system according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a video chat system according to an embodiment of the present invention, Figure 2 is a block diagram showing the configuration of a terminal device according to an embodiment of the present invention, Figure 3 shows the operation of the terminal device of FIG. 4 is a diagram illustrating a video chat selection screen according to an embodiment of the present invention, FIG. 5 is a diagram illustrating a video chat selection screen according to another embodiment of the present invention, and FIG. 6 is another diagram of the present invention. FIG. 7 is a diagram illustrating a video chat selection screen according to an embodiment, FIG. 7 is a diagram illustrating a video chat screen according to an embodiment of the present invention, and FIG. 8 is a diagram illustrating a video chat screen according to another embodiment of the present invention.

First, referring to FIG. 1, a video chat system includes a calling terminal 100, a called terminal 200, a video chat server 300, an SMS (Short Message Service) server 400 and a network 500. Include.

Here, the calling terminal 100 and the called terminal 200 are terminals equipped with an SMS application supporting video chat, and capable of data communication. The calling terminal 100 and the called terminal 200 may include, for example, a mobile phone, a smartphone, a tablet PC.

In this case, the calling terminal 100 and the called terminal 200 have different communication channels, that is, a first communication channel and a second communication channel, connected to the network 500.

Here, the first communication channel includes a data channel for implementing a communication service according to a packet switched method based on an Internet Protocol (IP).

 The second communication channel is a communication channel in which a communication service according to a circuit switched method is implemented, and includes an SMS channel. The SMS channel refers to a communication channel in which a message service of a mobile communication service provider provided through the SMS gateway 400 is implemented.

Therefore, in the following description, the first communication channel will be collectively referred to as a data channel, and the second communication channel will be collectively referred to as an SMS channel.

The calling terminal 100 and the called terminal 200 implement a video chat based on the video stream transmitted and received through the data channel and the text data transmitted and received through the SMS channel. In this case, the data channel may transmit and receive voice data, and the voice data may be provided together during the video chat.

Here, a configuration of a terminal device for implementing a video chat based on the calling terminal 100 will be described with reference to FIG. 2.

Referring to FIG. 2, the calling terminal 100 includes a display unit 101, a communication unit 103, a memory 105, and a processor 107. Each component will be described below.

The display unit 101 is provided outside the calling terminal 100, is connected to the processor 107, and outputs information according to the operation of the processor 107 on the screen. A commercially available LCD (Liquid Crystal Display) or the like can be used.

The communicator 103 is connected to the processor 107 to transfer the video stream and the text data received through the data channel and the SMS channel to the processor 107, and the video stream and the text output from the processor 107. The data is transmitted to the network 500 through the data channel and the SMS channel. The communication unit 103 may include a baseband circuit for processing a radio signal.

The memory 105 is connected to the processor 107 and stores various information for driving the processor 107, an SMS application, a phone book application, and the like. The memory 105 may be embodied in a medium such as RAM, such as dynamic random access memory, Rambus Dynamic Random Access Memory (DRAM), synchronous DRAM, and static RAM. The memory 105 may be inside or outside the processor 107 and may be connected to the processor 107 through various well-known means.

The processor 107 may be implemented as a central processing unit (CPU) or other chipset, a microprocessor, etc., and the layers of the air interface protocol may be implemented by the processor 107. At this time, the processor 107 includes a video chat control unit 109.

The video chat control unit 109 executes an SMS application stored in the memory 105 to display a video chat screen including a video stream transmitted and received through a data channel and text data transmitted and received through an SMS channel. A configuration is output to the display unit 101.

In addition, the video chat controller 109 may output voice data transmitted and received through a data channel together with a video chat screen through a speaker (not shown).

Here, the SMS application includes a default application that is pre-loaded at the time of manufacture of the terminal, that is, provided by the mobile communication service provider. In addition, it includes an application of the form that can be downloaded and mounted via the network 500, for example, a smartphone application.

Then, the operation of the calling terminal 100 having the configuration described above is the same as FIG.

Referring to FIG. 3, the video chat control unit 109 executes an SMS application (S101). When the user selects a video chat (S103), an INVITE SMS message for initiating a video chat session with the called terminal 200 is transmitted (S105).

Here, the video chat control unit 109 may initiate a video chat session according to the following three embodiments.

That is, according to one embodiment, as shown in FIG. 4, the display unit 101 outputs a video chat icon 601 on the SMS application screen 600. If the user selects the video chat icon 601 through an input unit (not shown), the video chat control unit 109 performs step S105. In this case, after inputting the telephone number of the called terminal 200 in the "To" column, the video chat icon 601 may be selected.

In addition, according to another embodiment, as shown in FIG. 5, the display unit 101 outputs a video chat icon 701 on the phonebook application screen 700. If the user selects the video chat icon 701 through an input unit (not shown), the video chat control unit 109 performs step S105. In this case, the called terminal 200 may be a user displayed on the phone book application screen 700.

Further, according to another embodiment, as shown in FIG. 6, the display unit 101 outputs a video chat icon 801 on the SMS message receiving screen 800. When the user selects the video chat icon 801 through an input unit (not shown), the video chat controller 109 performs step S105. That is, the user may select the video chat icon 801 while switching the SMS message with the destination terminal 200 to switch to the video chat mode.

Although not shown, the video chat icon may be displayed on the terminal standby screen.

The operation of initiating the video chat session by the video chat controller 109 described above is not limited to the above embodiments, and various embodiments are possible.

Referring back to FIG. 3, after performing step S105, the video chat control unit 109 determines whether an accept SMS message is received from the destination terminal 200 to accept the video chat. It is determined whether a cancel (CANCEL) SMS message is received (S107).

Here, when a response (SMS) message is received, the video chat control unit 109 starts a video chat session with the called terminal 100 (S109).

The video chat controller 109 receives a video stream through a data channel (S111) and receives text data through an SMS channel (S113). The video stream and text data received in steps S111 and S113 are simultaneously configured as a video chat screen and output to the display unit 101 (S115).

In this case, the video chat controller 109 may display the video stream and the text data on a part of the video chat screen as shown in FIG. 7. That is, the video chat screen 900 may be divided into a portion 901 for outputting a video stream and a portion 903 for outputting text data.

Alternatively, the video chat controller 109 may display the video stream and the text data to overlap each other as shown in FIG. 8. That is, the text chat screen 1000 may output text data on the region 1001 where the video stream is displayed.

In addition, if it is determined in step S107 that a cancellation (CANCEL) SMS message is received, the video chat control unit 109 cancels the video chat session with the destination terminal (200) (S117).

Meanwhile, referring back to FIG. 1, the calling terminal 100 is connected to the video chat server 300 and the SMS gateway 400 through the network 500 to implement video chat.

Here, the video chat server 300 relays the establishment of a video chat session in which a video stream is transmitted and received through a data channel and text data is transmitted and received through an SMS channel.

The SMS server 400 is a device for processing a message service of a mobile communication service provider and may include a Short Message Service Center (SMSC) and a Short Messge Service Gateway (SMSGW). The SMS server 400 performs an SMS storage and management function, an SMS transmission function, and the like. For example, when the terminating terminal 200 cannot receive an SMS, the terminating terminal 200 stores the SMS until the terminating terminal 200 can receive the SMS. Will pass. In addition, if SMS transmission fails, retransmission may be attempted a predetermined number of times at regular time intervals.

In this case, the SMS server 400 sends and receives an INVITE SMS message and a response SMS to the originating terminal 100 and the called terminal 200 to establish a video chat session. Deliver message and cancellation CANCEL SMS message. In addition, the SMS 100 transmits an SMS message including text data for implementing a video chat between the calling terminal 100 and the called terminal 200.

The network 500 enables the originating terminal 100 to access the video chat server 300 and the SMS server 400. The network 200 may include a base station, a base station controller, a mobile switching center, a device for packet data service (PDSN, SGSN), and the like.

In this case, the network 500 may include a Wi-Fi network, a Global System for Mobile communications (GSM) network, a general packet radio service (GPRS) network, an enhanced data GSM environment (EDGE) network, and an EVDO network. Evolution Data Optimized CDMA2000) network, 3G network, 4G network, LTE may include a long term evolution (LTE) network.

Now, a series of processes of the video chat method will be described based on the above description.

9 is a flowchart illustrating a video chat method according to an embodiment of the present invention, and FIG. 10 is a diagram illustrating a screen of a called terminal according to an embodiment of the present invention.

Hereinafter, in the specification, an "SMS message" means a message transmitted in an SMS form, and a "message" is defined as a message transmitted in a packet form.

First, referring to FIG. 9, the video chat control unit 109 of FIG. In step S201, the message is transmitted.

In this case, the INVITE SMS message includes a method parameter set to INVITE, a calling number parameter including a phone number of the calling terminal 100, and a called number including a phone number of the called terminal 200. Contains a number parameter.

Then, the SMS server 400 transmits the INVITE SMS message to the called terminal 200 (S103).

On the other hand, the video chat control unit 109 of the calling terminal 100 transmits a TRYING message to the video chat server 300 after performing step S201 (S105).

Here, the TRYING message serves to notify that the calling terminal 100 transmits an INVITE SMS message to the called terminal 200, that is, requests a video chat session. The TRYING message includes a method parameter set to 'TRYING', a calling number parameter containing a telephone number of the calling terminal 100 and a called number parameter containing a telephone number of the called terminal 200.

Next, the video chat server 300 records a video chat session log (S207). The video chat session log may include a phone number of the calling terminal 100, which is a video chat session requester, and a phone number of a called terminal 200, which is a video chat session counterpart.

On the other hand, the destination terminal 200 determines whether the user accepts or rejects the video chat request (S209).

In this case, the called terminal 200 may output a video chat request screen (or message) 900 as shown in FIG. 10, and determine whether the user selects the accept icon 901 or the reject icon 903. .

Next, when the user accepts the video chat request in step S209, the destination terminal 200 transmits an accept SMS message to accept the video chat (S211). Then, the SMS server 400 transmits the acceptance SMS message received in step S211 to the calling terminal 100 (S213).

Here, the accept SMS message includes a method parameter set to 'OK', a calling number parameter containing a telephone number of the called terminal 200, and a called number parameter containing a telephone number of the calling terminal 200.

In addition, after receiving the OK SMS message in step S211, the called terminal 200 transmits a session join (JOIN) message to the video chat server 300 (S215).

Here, the session participation (JOIN) message includes a method parameter set to 'JOIN', a caller number parameter in which the phone number of the called terminal 200 is recorded, and a 'PEER' parameter in which the phone number of the caller terminal 200 is recorded.

Then, the video chat server 300 checks the video chat session log history (S217). If there is a session log for the called terminal 20, a response (OK) message including the IP address of the calling terminal 100 to be used in the data channel is transmitted to the called terminal 200 (S219).

Here, the response (OK) message includes a method parameter set to 'OK', a 'PEER' parameter containing the telephone number of the calling terminal 100 and an IP parameter containing the IP address of the calling terminal 200.

In addition, when an accept SMS message is received in step S213, the calling terminal 100 transmits a session join (JOIN) message to the video chat server 300 (S221).

Here, the session participation (JOIN) message includes a method parameter set to 'JOIN', a calling number parameter in which the telephone number of the calling terminal 100 is recorded, and a 'PEER' parameter containing a telephone number of the called terminal 200.

Then, the video chat server 300 transmits a response (OK) message including the IP address of the called terminal 200 to the calling terminal 100 (S223).

Here, the response (OK) message includes a method parameter set to 'OK', a 'PEER' parameter containing the telephone number of the called terminal 100 and an IP parameter containing an IP address of the called terminal 200.

In this case, it is assumed that the video chat server 300 knows the IP addresses of the calling terminal 100 and the called terminal 200 in advance.

Accordingly, a video chat session is established between the calling terminal 100 and the called terminal 20 (S225).

Thereafter, the calling terminal 100 and the called terminal 200 transmit and receive a video stream through a data channel (S227). In this case, voice data may be additionally transmitted and received. In operation S229, text data is transmitted and received through an SMS channel.

On the other hand, when the user selects rejection in step S209, the destination terminal 200 transmits a cancellation SMS message (CANCEL SMS) message to reject the video chat (S231). Then, the SMS server 400 transmits a cancellation SMS message to the calling terminal 100 (S233).

Here, the cancellation SMS message includes a method parameter set to 'CANCEL', a calling number parameter including a phone number of the called terminal 200 and a called number parameter containing a phone number of the calling terminal 100.

Next, the video chat control unit 109 of the calling terminal 100 transmits a CANCEL message to the video chat server 300 to cancel the video chat session (S235).

Here, the CANCEL message includes a method parameter set to 'CANCEL', a calling number parameter including a phone number of the calling terminal 100 and a called number parameter containing a phone number of the called terminal 200.

Then, the video chat server 300 deletes the video chat session log recorded in step S207 (S237). And a response (OK) message is sent to the calling terminal 100 (S239).

Accordingly, the video chat session is canceled between the calling terminal 100 and the called terminal 20 (S241).

Meanwhile, steps S227 and S229 described above are implemented in the following embodiments depending on whether the IP addresses of the calling terminal 100 and the called terminal 200 are a public IP type or a private IP type. Can be.

11 is a flowchart illustrating a video stream transmission process according to an embodiment of the present invention.

Referring to FIG. 11, the video chat control unit (109 of FIG. 2) of the calling terminal 100 establishes a video chat session with the called terminal 200 (S301), and then establishes a data channel using mutual IP addresses. The video stream is directly transmitted / received (S303). In this case, the direct transmission and reception means transmission through only the network 500 without going through a separate server. In this case, the calling terminal 100 and the called terminal 200 may transmit and receive a video stream using a Hyper Text Transfer Protocol (HTTP).

In addition, regardless of whether it is a public IP address or a private IP address, the text data is transmitted and received through the SMS channel (S305).

12 is a flowchart illustrating a video stream transmission process according to another embodiment of the present invention.

Referring to FIG. 12, the video chat control unit (109 of FIG. 2) of the calling terminal 100 establishes a video chat session with the called terminal 200 (S401), and then establishes a data channel using each other's private IP addresses. The video stream is transmitted and received via the video chat server 300 (S403 and S405). That is, the video stream transmitted from the calling terminal 100 and the called terminal 200 is relayed to the counterpart terminal after network address translation is performed in the video chat server 300.

Here, the originating terminal 100 and the called terminal 200 is a network including a STUN (Session Traversal Utilities for NAT) protocol, a turn (TRA), Traversal Using Relay NAT (TURN) protocol, ICE (Interactive Communication Environment) protocol You can use the address translation protocol.

In addition, regardless of whether it is a public IP address or a private IP address, the text data is transmitted and received through an SMS channel (S407).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (22)

Sending, by the calling terminal, a video stream with the called terminal through a first communication channel;
Transmitting / receiving text data by the calling terminal to and from the called terminal through a second communication channel different from the first communication channel; And
Outputting a video chat screen including the video stream and the text data by the calling terminal;
Video chat method that includes. The method of claim 1,
The first communication channel includes a communication channel for implementing a communication service according to a packet switched method based on an IP (Internet Protocol),
The second communication channel comprises a communication channel that implements a communication service according to the circuit switched (Circuit Switched) scheme. The method according to claim 2, wherein
The second communication channel comprises a Short Message Service (SMS) channel. The method of claim 3,
Before the step of transmitting and receiving the video stream,
Establishing, by the calling terminal, a video chat session by exchanging SMS messages requesting and accepting a video chat with the called terminal;
Wherein the outputting step comprises:
And configuring the video chat screen based on the data stream and the text data transmitted and received with the called terminal in which the video chat session is established. 5. The method of claim 4,
The establishing step,
Transmitting, by the calling terminal, an INVITE SMS message requesting a video chat to the called terminal;
Notifying, by the calling terminal, that the INVITE SMS message is transmitted to a video chat server;
Receiving, by the calling terminal, an Accept SMS message that accepts a video chat from the called terminal;
Obtaining IP information of the called terminal from the video chat server; And
Establishing a video chat session with the called terminal;
Transmitting and receiving the video stream,
And transmitting and receiving the video stream through the first communication channel using IP information of the called terminal. 6. The method of claim 5,
The INVITE SMS message is,
And a method parameter set to an address, a calling number parameter containing a telephone number of the calling terminal, and a called number parameter containing a telephone number of the called terminal. 6. The method of claim 5,
The step of transmitting the invite SMS message to the called terminal,
When the calling terminal detects a user input signal for selecting any one of a video chat menu provided on an SMS application screen, a video chat menu provided on a phone book, and a video chat menu provided on an SMS message screen, And transmitting the INVITE SMS message. 6. The method of claim 5,
Acquiring the IP information,
Transmitting, by the calling terminal, a session join message packet to the video chat server when the OK SMS message is received; And
Receiving an OK message packet including an IP address of the called terminal from the video chat server,
And the called terminal transmits a session join message packet to the video chat server to receive an OK message packet including the IP address of the calling terminal. 6. The method of claim 5,
Transmitting and receiving the video stream,
When the IP information of the called terminal is a public IP type, transmitting and receiving a data stream directly with the called terminal; And
When the IP information of the called terminal is a private IP type, transmitting and receiving a data stream relayed by the video chat server with the called terminal;
Video chat method that includes. 10. The method of claim 9,
Transmitting and receiving the direct data stream,
And sending, by the calling terminal, the direct data stream to and from the called terminal using a Hyper Text Transfer Protocol (HTTP). 10. The method of claim 9,
Transmitting and receiving the relaying data stream with the called terminal,
And transmitting, by the calling terminal, the relaying data stream with the called terminal using a network address translation protocol. The method of claim 1, wherein
Transmitting and receiving voice data with the called terminal by the calling terminal through a first communication channel; and
Outputting the voice data through a speaker
Video chat method that includes more. A video chat control unit constituting a video chat screen including a video stream to transmit / receive to / from the counterpart terminal through a first communication channel and text data to / from the counterpart terminal through a second communication channel different from the first communication channel; And
A display unit for outputting the video chat screen
. 14. The method of claim 13,
Further comprising a memory for storing the Short Message Service (SMS) application,
The first communication channel is a communication channel for implementing a communication service according to the packet switched (Packet Switched) method based on the Internet Protocol (IP), the second communication channel is an SM channel,
The video chat control unit,
In response to a user's input signal, the SMS application is executed to exchange SMS messages for requesting and accepting a video chat with the counterpart terminal, and IP information of the counterpart terminal to be used in the first communication channel. Obtaining a video chat server from the video chat server to establish a video chat session. 15. The method of claim 14,
The SMS application,
Terminal device including a default application that is installed at the time of manufacture. 15. The method of claim 14,
The SMS application,
Terminal device comprising a smartphone application that can be downloaded and installed from a server connected to the network. 15. The method of claim 14,
The video chat control unit,
After sending INVITE SMS requesting a video chat to the counterpart terminal, notifying the video chat server to transmit the INVITE SMS message, and accepting the video chat from the counterpart terminal. Upon receipt of an SMS message, a cancellation SMS message for acquiring IP information of the counterpart terminal from the video chat server to establish the video chat session, and rejecting the video chat from the counterpart terminal. Is received, sending a CANCEL message packet notifying the video chat server of the cancellation of the video chat session, and upon receipt of an OK message packet, the establishment of the video chat session is cancelled. A video chat server for transmitting and receiving a video stream between a calling terminal and a called terminal through a data channel, and establishing a video chat session in which text data is transmitted and received through an SMS (Short Message Service) channel; And
An SMS server for transmitting an SMS message including text data transmitted and received between the calling terminal and the called terminal.
Video chat system comprising a. 19. The method of claim 18,
The video chat server,
A session received from the originating terminal by receiving a TRYING message packet notifying that the originating terminal transmits an INVITE SMS message requesting a video chat to the called terminal; In response to a JOIN message packet, a response message packet including IP information of the calling terminal to be used in the data channel is transmitted, and a response to the session join message packet transmitted by the calling terminal. And transmitting an OK message packet containing IP information of the called terminal to be used in the data channel. 20. The method of claim 19,
The video chat server,
And when the IP information of the calling terminal and the IP information of the called terminal are a private IP type, relaying the data stream between the calling terminal and the called terminal using a network address translation technique. 20. The method of claim 19,
The video chat server,
And transmitting an acknowledgment (OK) message packet when a CANCEL message packet according to the rejection of the video chatting session of the called terminal is received after receiving the TRYING message packet from the calling terminal. 22. The method of claim 21,
The SMS server,
A video chat that delivers the INVITE SMS message, an accept SMS message that accepts the video chat transmitted by the called terminal, and a cancel SMS message that rejects the video chat. system.

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