KR20060013317A - System for providing joint viewing service of moving picture - Google Patents

Abstract

The present invention relates to a personal broadcast system. The system according to the present invention receives broadcast server allocation request information from a broadcaster or listener client provided with a broadcast program, and transmits address information of a broadcast server to a broadcaster or listener client. Providing information management server; A broadcast server for establishing a connection in response to the connection request information of the broadcaster client or the listener client and transmitting broadcast stream data transmitted from the broadcaster client to the corresponding listener client; A database for receiving and storing state information from the broadcast server when the broadcaster client or the listener client connects to or disconnects from the broadcast server; The broadcast program installed in the broadcaster client converts the video data of the broadcaster or the video data stored in the local client and the audio data to be output to the broadcast into a protocol packet including a synchronization identifier, and transmits it to the broadcast server. Data signal and sync identifier information are extracted from the protocol packet, and the audio signal and the video signal are synchronized and output.

Synchronous, Broadcast Server, Video, Winamp

Description

Personal broadcasting system {System for Providing Joint Viewing Service of Moving Picture}             

1A is a diagram showing an example of a conventional broadcast system.

1B is a view showing an example of another conventional broadcast system.

2 is a diagram illustrating a configuration of a personal broadcasting system according to an exemplary embodiment of the present invention.

3A is a diagram illustrating a module configuration of a dedicated program installed in a listener and a broadcaster client according to an exemplary embodiment of the present invention.

3B is a block diagram showing the configuration of a broadcast transmission module according to an embodiment of the present invention.

3C is a block diagram illustrating a configuration of a broadcast receiving module according to an embodiment of the present invention.

4 is a block diagram showing the module configuration of a broadcast server according to an embodiment of the present invention.

5 is a diagram illustrating a process of receiving a broadcast server to which a broadcaster client accesses according to an embodiment of the present invention.                 

6 is a diagram illustrating a process of receiving a broadcast server to which a listener client connects according to an exemplary embodiment of the present invention.

7A and 7B are diagrams showing the configuration of a packet to be converted by the synchronization / protocol conversion module.

8 is a diagram showing the configuration of a system for synchronizing broadcast data and external data using a broadcast system according to the present invention;

The present invention relates to a personal broadcast system, and more particularly, to a personal broadcast system and method capable of simultaneously providing audio and video to a listener.

1A is a diagram illustrating an example of a conventional broadcast system.

As shown in FIG. 1A, in the conventional broadcast system, the listener client 102 and the broadcaster client 100 are connected through a wired network such as the Internet.

In the related art, the broadcaster client 100 is provided with a program for transmitting music and a comment of a broadcaster and a shoutcast server program for transmitting a broadcast stream to the listener. As a program for transmitting music and broadcasters' comments, most of them use Winamp.

Since the shoutcast server program is installed in the broadcaster client 100 in the system of FIG. 1A, the broadcaster client serves as a broadcast server. The music and the words output by the broadcaster are synthesized by the winamp, and the synthesized audio signal is transmitted to the network under the control of the shoutcast program.

The listener client 102 is provided with a program for receiving and outputting a broadcast stream, and most of these programs use a winamp.

In a system such as FIG. 1A, the listener client needs to know the IP address and port number of the broadcaster client to access the broadcaster client. Therefore, it is troublesome to find a broadcaster who wants to listen to the broadcast, and there is a problem in that the public cannot be effectively promoted. In particular, when a broadcaster uses a dynamic IP, the IP address changes every time it broadcasts, and there is a hassle to inform the updated IP continuously.

In addition, since the broadcaster client plays a role as a broadcast server, there is a problem that many listeners cannot simultaneously listen to the broadcast due to the limitation of bandwidth.

1B is a diagram illustrating an example of another conventional broadcast system.

Another conventional broadcast system as shown in FIG. 1B includes a broadcaster client 110, an information management server 112, a shoutcast server 114, and a listener client 116. FIG. 1B is an improved system of FIG. 1A, in which broadcast stream data output from the broadcaster client 110 is transmitted to a listener client 116 through a separate shoutcast server 114.

In the case of FIG. 1A, since a broadcaster client plays a role as a shoutcast server, there is a problem in that a broadcast request of many listeners cannot be accommodated. Thus, in the system of FIG. 1B, a separate shoutcast server 114 is provided. The system of FIG. 1B can accommodate more listeners than the system of FIG. 1A because the shoutcast server 114 with a relatively high bandwidth relays the broadcast stream.

In the system of FIG. 1B, a broadcaster client is provided with a winamp for broadcasting a broadcast stream, and a plug-in program for interworking with the shoutcast server 114 is installed.

The information management server 112 provides the broadcast establishment information of the broadcaster clients to other users through communication with the shoutcast server 114. The listener client 116 may access the information management server 112 to check the information of the broadcasters, and the desired broadcaster may access the shoutcast server 114 to receive the broadcast stream. Can be. Unlike the case of FIG. 1A, since the information management server provides information about the broadcaster, the listener can receive the broadcast service even if the IP address and port number of the broadcaster client are not known.

The broadcaster client 110 and the listener client 116 are provided with a winamp program for transmitting or receiving a broadcast stream.

Conventional broadcast systems as described above use the Winamp as a broadcast program. However, the Winamp not only provided an audio signal but also provided an image signal as a broadcast signal, and thus could only listen to the broadcaster's voice and music provided by the broadcaster. Recently, the use of web cameras is increasing, and the demand for providing broadcaster's image information is also increasing. However, there is a problem that conventional winamp programs and shoutcast servers cannot accommodate such a request.

In addition, it is important to properly assign a broadcaster to a low-loading shoutcast server for smooth broadcasting. Conventional shoutcast servers do not provide status information in real time, so the information management server communicates with the shoutcast server. As a result of determining the problem, there was a problem in that no broadcaster assignment could be made.

In order to solve the problems of the prior art as described above, the present invention proposes a personal broadcasting system capable of simultaneously providing audio and video.

Another object of the present invention is to propose a personal broadcasting system capable of providing broadcasting by synchronizing audio and video synchronization.

It is still another object of the present invention to propose a personal broadcasting system capable of more efficiently allocating a broadcast server to a broadcaster by updating state information of the broadcast server in real time.

In order to achieve the above object, according to a preferred embodiment of the present invention, the broadcaster or the broadcaster to the address information of the broadcast server to be accessed by receiving the broadcast server allocation request information from the broadcaster or listener client is installed, the broadcaster or An information management server provided to the listener client; A broadcast server for establishing a connection in response to the connection request information of the broadcaster client or the listener client and transmitting broadcast stream data transmitted from the broadcaster client to the corresponding listener client; A database for receiving and storing state information from the broadcast server when the broadcaster client or the listener client connects to or disconnects from the broadcast server; The broadcast program installed in the broadcaster client converts the video data of the broadcaster or the video data stored in the local client and the audio data to be output to the broadcast into a protocol packet including a synchronization identifier, and transmits it to the broadcast server. There is provided a personal broadcasting system, which extracts data signal and sync identifier information from the protocol packet, and outputs the same synchronization of the audio signal and the video signal.

According to another embodiment of the present invention, a system comprising a broadcaster client for transmitting a broadcaster stream, a listener client for receiving the broadcast stream, a broadcast server for relaying the broadcast stream between the broadcaster client and the listener client, and an information management server. A personal broadcasting program installed in the broadcaster client and the listener client, comprising: an access module for accessing the broadcast server using address information of the broadcast server allocated from the information management server; A broadcast transmission module for assigning a synchronization identifier to an audio signal and a video signal to be broadcast, generating a preset protocol packet including the synchronization identifier, and transmitting the same to a broadcast server; The audio signal and the video signal are separated from the protocol packets received through the broadcast server, the data signal and the sync identifier information are extracted from the separated signal, and the audio signal and the video signal are synchronized according to the sync identifier information. There is provided a program for personal broadcasting including broadcast receiving modules for controlling.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of a personal broadcast system according to the present invention.

2 is a diagram illustrating a configuration of a personal broadcasting system according to an exemplary embodiment of the present invention.

As shown in FIG. 2, a personal broadcasting system according to an exemplary embodiment of the present invention includes a broadcast server 200, a broadcaster client 202, a state information database 204, an information management server 206, and a listener client ( 208).

In FIG. 2, when receiving the broadcast request information from the broadcaster, the information management server 206 searches the state information database 204 for a broadcast server to which the broadcaster can access and provides address information of the broadcast server to be connected.

In addition, when receiving broadcast listening request information from a listener, the information management server 206 searches the state information database and provides address information of a broadcast server provided with a broadcast requested by the user.

The broadcaster client transmits broadcast request information to the information management server 206 to receive broadcast server address information to be connected, and transmits a broadcast signal through the broadcast server.                     

The information management server may provide a web page from which a broadcaster or listener can request a broadcast service, and the web page may be provided by another information management server. In addition, the interface for the broadcast request may be provided to the user in a format other than a web page, for example, in the form of a dedicated program. The web page includes a menu for requesting a broadcast or for listening to a broadcast, and a broadcaster or a listener can receive a broadcast service through the corresponding menu.

The broadcaster client 202 is provided with a program for transmitting broadcast data and a plug-in program for interworking with a broadcast server.

In the past, a win amplifier was generally used as a broadcast program, but in the present invention, a dedicated broadcast program capable of simultaneously transmitting audio and video is provided. The installed broadcast program generates a packet including information on an audio and video signal and transmits the packet to the broadcast server. Since both audio and video signals are transmitted as broadcast signals, the packet protocol structure generated by the broadcast program is different from the packet protocol structure of the conventional winamp, which will be described later with a separate drawing.

In addition, the broadcast program functions to add a synchronization identifier to audio and video signals. Although both video and audio signals are transmitted to the listener client through the broadcast server, video and audio are inconsistently output when the signals are not synchronized. Therefore, the broadcast program adds a synchronization identifier to the video and audio signals, respectively.

The broadcast server 202 functions to provide a broadcast client with a broadcast stream provided from the broadcaster client. The broadcast server maintains a connection between the broadcaster client 200 and the listener client, and enables the broadcast stream to be stably provided to the listener client.

The manner in which the broadcast server 202 maintains the connection between the broadcaster and the listener and provides a stream is not different from the conventional method. However, since the broadcast server 202 according to the present invention provides image information in addition to audio information as broadcast stream information, a conventional shoutcast server cannot be used. The broadcast server according to the present invention includes a module capable of analyzing a packet transmitted from a broadcaster client in a dedicated protocol manner and providing the same to a listener.

In addition, the broadcast server 200 according to the present invention provides the current state information to the state information database in real time. When a broadcast request is received from a broadcaster or a request is received from a listener, the broadcast server 200 processes the request information and provides the state change information to the state information database 204.

In a broadcast system using a conventional shoutcast server, the shoutcast server manages state change information only on its own and cannot provide it to other servers in real time. Therefore, when a broadcast server is assigned in a conventional broadcast system, the information management server has to parse state information through communication with a shoutcast server. This parsing operation is not only a cumbersome procedure, but also occurs periodically, there was a problem that can not grasp the state information of the broadcast server in real time. However, according to the present invention, since the broadcast server 200 provides the state change information to the database 204 in real time, more efficient broadcast server allocation can be achieved.                     

The state information database 204 stores state information of each broadcast server to be managed. According to a preferred embodiment of the present invention, the state information database 204 includes the number of broadcasting stations established for each broadcasting server, the number of listeners connected to each broadcasting station, the total number of listeners connected to the broadcasting server, the information of broadcasters, and the like. Manage.

The listener client 208 receives information about a broadcast server on which a desired broadcaster broadcasts through communication with the information management server 206, and accesses the broadcast server to receive a broadcast stream.

As in the case of the broadcaster client 202, the listener client 208 is provided with a dedicated broadcast program capable of receiving and outputting video and audio. The dedicated program installed in the listener client 208 outputs the synchronized video and audio information in synchronization.

3A is a diagram illustrating a module configuration of a dedicated program installed in a listener and a broadcaster client according to an exemplary embodiment of the present invention.

The dedicated program according to an embodiment of the present invention may include a connection module 300, a broadcast transmission module 302, and a broadcast reception module 304.

In FIG. 3A, the access module 300 accesses a broadcast server assigned by a broadcaster or a listener client from an information management server.

According to an embodiment of the present invention, the information management server provides IP address and port number information of the broadcast server as address information of the broadcast server, and the access module uses this information to access the broadcast server. That is, in this case, only IP and port are used as address identification information of the broadcast server.

According to another embodiment of the present invention, the information management server provides IP address, port number and MP (Mount Point) information of the broadcast server as address information, and the access module uses this information to connect to the broadcast server. When the icecast method is used as the broadcast module of the broadcast server, the MP information, which is an identification means lower than the port, may be included in the address information. When the MP information is the ID of the broadcaster, there is an advantage that the broadcaster can easily know the address information that the broadcaster is using only the ID of the broadcaster.

The broadcast transmission module 302 converts the information that the broadcaster wants to broadcast into broadcast stream information and transmits it to the connected broadcast server. The broadcast reception module 304 receives broadcast stream information from the broadcast server and reproduces it. Function. The detailed configuration of the broadcast transmission module 302 and the broadcast reception module 304 will be described below with reference to FIGS. 3B and 3C.

3B is a block diagram showing the configuration of a broadcast transmission module according to an embodiment of the present invention.

As shown in FIG. 3B, the broadcast transmission module according to the preferred embodiment of the present invention includes an external audio signal conversion module 310, an internal audio signal conversion module 312, an audio signal synthesis module 314, and an audio signal conversion. The module 316 may include a video signal receiving module 318, a sync / protocol conversion module 320, and a queue 322.

In FIG. 3B, the external audio signal conversion module 310 receives an external sound source received through a microphone. Most of the external audio signal received through the microphone will be the voice information of the broadcaster, the external audio signal conversion module 310 converts it to an uncompressed signal in the form of a wave.

The internal audio signal conversion module 312 is stored in the broadcaster client and functions to convert the audio file that the broadcaster intends to output through broadcast into wave-shaped data. In personal broadcasting, voice information of the broadcaster is input through a microphone, but music is generally provided to the broadcaster using a music file stored in the client. Most music files stored on the client are compressed files such as MP3, and these compressed files cannot be synthesized with the voice information of the broadcaster. Therefore, the internal audio signal conversion module 312 converts the audio signal of the broadcast music file into wave information.

The audio signal synthesizing module 314 synthesizes an external audio signal output by the external audio signal receiving module 310 and an internal audio signal in a wave form converted by the internal audio signal conversion module 312. Since the synthesis of the wave signal is a known technique, a detailed description thereof will be omitted.

The audio signal conversion module 316 converts a wave signal output from the audio signal synthesis module 314 into a music file of a preset format. According to an embodiment of the present invention, the audio signal conversion module 316 converts a wave signal into a music file in MP3 or ogg format. Since a technique for converting a wave signal into MP3 or ogg format information is also known, a detailed description thereof will be omitted.

The image receiving module 318 serves to receive image information from a web camera or the like. The image receiving module 318 may also perform a function of converting image file information stored in a broadcaster client into a form that can be transmitted through broadcast as well as receiving an external image.

The synchronization / protocol conversion module 320 functions to insert a synchronization identifier into the video signal provided from the image receiving module 318 and the audio signal provided from the audio signal conversion module 316. According to a preferred embodiment of the present invention, the synchronization identifier inserted in the synchronization / protocol conversion module 320 may be time stamp information.

When receiving a video signal or an audio signal, the synchronization / protocol conversion module 320 inserts time stamp information into the received signal to generate a converted protocol packet. The synchronization / protocol conversion module 320 generates a protocol packet having a structure as shown in FIGS. 7A and 7B.

7A and 7B are diagrams illustrating a configuration of a packet converted by the synchronization / protocol conversion module 320.

Referring to FIG. 7A, a protocol packet according to an embodiment of the present invention may include a type field 700, a time stamp field 702, a size field 704, and a data field 706.

The type field 700 includes information about the type of a packet. Packet types include audio packets, video packets, and keyframe packets. The video signal is classified into a video packet and a keyframe packet because the change information is provided as a video packet based on a keyframe. The synchronization / protocol conversion module 320 determines whether the input signal is an audio signal, a general video signal, or a keyframe signal, and adds the identifier to the type field.

In the time stamp field 702, tie stamp information provided by the synchronization / protocol conversion module 320 is recorded. According to an embodiment of the present invention, the synchronization / protocol conversion module 320 records the local time of the broadcaster client as time stamp information in a packet. However, it will be apparent to those skilled in the art that other time values may be utilized as the time stamp information.

The size field 704 includes information on the size of data, and the size information is mainly used when checking an error.

The data field 706 includes audio data or image data output from the audio signal conversion module 316 or the image receiving module 318.

7B is a diagram illustrating a configuration of a protocol packet according to another embodiment of the present invention.

7B shows a protocol packet further including a frame count field 708. The frame count information is used to synchronize other data in addition to the synchronization of the audio signal and the image signal, which will be described later with reference to a separate drawing.

3C is a block diagram illustrating a configuration of a broadcast receiving module according to an embodiment of the present invention.

As shown in FIG. 3C, the broadcast reception module according to an embodiment of the present invention may include a scenic stream reception module 330, a signal separation module 332, an audio signal decoding module 334, a synchronization module 336, and an image. The signal decoding module 338 may be included.

The broadcast stream receiving module 330 functions to receive broadcast stream data provided from a broadcast server. The packet structure of the stream data provided by the broadcast server has a structure as shown in FIG. 7A or 7B, and the broadcast server also transmits meta information of the audio signal.

The signal separation module 332 separates the broadcast stream signal received by the broadcast stream receiving module 330 into a video signal and an audio signal. The signal separation module may separate the audio signal and the video signal through the type information of the received packet. The signal separation module 332 separates the audio signal and the video signal into separate data queues, extracts only the time stamp information and the data information from the audio packet and the video packet, and provides them to the audio signal decoding module and the video signal decoding module, respectively. do.

The audio signal decoding module 334 decodes the audio signal received from the signal separation module 332. The audio signal is generally compressed in MP3 or ogg format, and the audio signal decoding module 334 decodes the audio signal with a corresponding decoding algorithm according to the compression format of the audio signal.

The audio signal decoding module 334 provides the synchronization module 336 with time stamp information of the packet to be decoded when the audio packet is decoded. Control to output only signals.                     

The video signal decoding module 338 decodes and outputs only the video signal having a corresponding time stamp according to the control to the synchronization module 336. The audio signal and the video signal may be synchronized and output by the operation.

4 is a block diagram showing the module configuration of a broadcast server according to an embodiment of the present invention.

As shown in FIG. 4, the broadcast server according to an embodiment of the present invention includes a broadcaster connection processing module 400, a listener connection processing module 402, a protocol conversion / analysis module 404, and a state information management module ( 406).

The broadcaster connection processing module 400 establishes a connection with the broadcaster client and executes a broadcast process in response to the broadcast request of the broadcaster. According to a preferred embodiment of the present invention, a broadcaster client connects to a broadcast server using three address identifiers of an address, a port, and an MP, and the broadcaster connection processing module 400 has a plurality of broadcast processes in one port. To be executed. Alternatively, it will be apparent to those skilled in the art that a broadcaster client may access a broadcast server using only address and port information, and one broadcast process may be executed for each port.

The listener connection processing module 402 establishes a connection with the listener client in response to the listener's connection request and enables the broadcaster's broadcast stream requested by the listener to be provided to the listener client. As described above, the listener client may access the broadcast server using address and port MP information, or may access the broadcast server using only address and port information.                     

 The protocol conversion / analysis module 404, when the listener client connected to the broadcast server does not install a program capable of processing protocol packets of the type shown in Fig. 7A or 7B, the protocol conversion / analysis module 404 sends the protocol packet transmitted from the broadcaster client. Converts into a general broadcast stream packet. When a listener client is provided with a program such as a general win-amp, not a broadcast program according to the present invention, the listener client cannot process a packet transmitted by the broadcaster client. Accordingly, the protocol conversion / analysis module 404 converts the packet transmitted from the broadcaster client into a general broadcast packet which is composed of only audio by removing video data. The type of broadcast program installed in the listener client may be known when the broadcast server and the listener client establish a connection.

In addition, the protocol conversion / analysis module 404 analyzes the header information of the packet to extract the meta information and send it to the listener client.

The state information management module 406 detects when a broadcaster or listener connects to or disconnects from a broadcast server and provides the detected information to a database. The state information management module 406 provides event occurrence information to a database whenever a connection or disconnection event of a listener or a broadcaster occurs, and thus, the state information management module 406 may check the state of the broadcast server in real time.

5 is a diagram illustrating a process of receiving a broadcast server to which a broadcaster client accesses according to an embodiment of the present invention.

Referring to FIG. 5, the broadcaster client transmits broadcast server address request information to the information management server (S500).

Upon receiving the broadcast server address request information from the broadcaster client, the information management server requests broadcast server information to which the broadcaster can access the database (S502).

The database receiving the request of the information management server determines the state information of the broadcast servers and provides address information (IP, port, MP) of the server to which the broadcaster client will access (S504). According to a preferred embodiment of the present invention, it is preferable to allocate a broadcaster client requesting a connection to a server which is already executing a broadcast process, and to allocate a new server when there is no room in the server where the broadcast process is running.

The information management server, which receives the address information of the server to which the broadcaster client accesses from the database, provides it to the broadcaster client (S506). The broadcaster client connects to the broadcast server by using the received address information of the server and starts broadcasting (S508). When the broadcaster client accesses, the broadcast server transmits the access information of the broadcaster client to the database in real time.

FIG. 6 is a diagram illustrating a process of receiving a broadcast server to which a listener client connects according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the listener client accesses the information management server and transmits broadcast server address request information (S600).

The information management server requests the database for address information of a server on which the broadcaster broadcasts using the broadcaster ID information provided from the listener client (S602).                     

The database inquires the state information of the stored broadcast servers, extracts the address information of the broadcast server broadcasted by the corresponding broadcaster, and transmits the information to the information management server (S604). Although not shown in FIG. 6, an intermediate proxy server may be provided between the broadcast server and the database, and communication between the information management server and the database may be performed through the intermediate proxy server.

The information management server, which receives the address information of the server that the broadcaster broadcasts from the database, delivers it to the listener client (S606), and the listener client accesses the broadcast server using the received address information (S608). The broadcast server provides the listener's connection information to the database in real time.

8 is a diagram illustrating a configuration of a system for synchronizing broadcast data and external data using the broadcast system according to the present invention.

As shown in FIG. 8, a system for synchronizing external data with broadcast data according to the present invention includes a broadcaster client 800, a broadcast server 802, a database 804, an external server 806, and a listener client 808. ) May be included.

The system as shown in FIG. 8 may be particularly useful when receiving game commentary information of a broadcaster while receiving game information such as Go and strategy games. In addition, the system as shown in FIG. 8 may be applied to a lecture in synchronization with document data such as a presentation.

For convenience of explanation, a system of FIG. 8 will be described on the assumption that online Go is provided in the game room, and one of the Go spectators is providing commentary.

The broadcast program of the broadcaster (commenter) client 800 transmits the audio and video information of the commentator in charge of commentary, which is performed in the online game room, to the broadcast server 802 by changing the protocol format as shown in FIG. 7B. It is more efficient to use frame count information than time stamp information to synchronize video and audio information with external data such as Baduk notation. Therefore, when synchronization between broadcast data and external data is to be synchronized, the broadcast program generates a packet having a protocol format as shown in FIG. 7B.

In addition, the broadcaster (narrator) client 800 transmits the Go notation information to the listener client 802 through the external server 806, where the external server is a server providing the Go game service. At this time, the Go notation information includes frame count information for synchronizing with the video and audio information of the commentator. Go notation information may be transmitted to the external server 806 through the Go game / watching program. Go game / watching program and broadcasting program may be an integrated program, or may be a separate program.

The listener client 808 receives the commentator's video and audio information through the broadcast server 802, and the Go notation data through the external server 806. The broadcast program of the listener client controls to output the corresponding video signal or the corresponding notation data when the audio signal is output based on the time stamp information and the frame count signal of the audio signal.

When the system as shown in FIG. 8 is used, the Go commentary information is provided to the observers through the broadcast server, so that the Go commentary service can be provided without a large limitation of the bandwidth, so that a relatively large number of users can receive the commentary service. For example, the synchronization of the notation data and the commentary information of the commentator can be provided accurately without deviation.

As described above, according to the personal broadcasting system according to the present invention, it is possible not only to provide audio and video at the same time, but also to provide synchronization by synchronizing audio and video.

In addition, according to the present invention, there is an advantage that the broadcast server can be allocated to the broadcaster more efficiently by updating the state information of the broadcast server in real time.

Claims (1)

An information management server receiving broadcast server allocation request information from a broadcaster or listener client provided with a broadcast program and providing address information of a broadcast server to be connected to the broadcaster or listener client; A broadcast server for establishing a connection in response to the connection request information of the broadcaster client or the listener client and transmitting broadcast stream data transmitted from the broadcaster client to the corresponding listener client; A database for receiving and storing state information from the broadcast server when the broadcaster client or the listener client connects to or disconnects from the broadcast server; The broadcast program installed in the broadcaster client converts the broadcaster's video data or the video data stored in the local client and the audio data to be output to the broadcast into a protocol packet including a synchronization identifier, and transmits it to the broadcast server The broadcast program installed in the listener client extracts the data signal and the synchronization identifier information from the protocol packet, and outputs the data signal by synchronizing the synchronization with the audio signal. The broadcast program may include: a connection module for accessing a corresponding broadcast server using address information of a broadcast server allocated from the information management server; A broadcast transmission module for converting an audio and video signal output from a broadcaster client into a predetermined protocol packet and transmitting it to the broadcast server; And a broadcast receiving module extracting an audio signal, a video signal, and a synchronization identifier information from the protocol packet received from the broadcast server, and outputting an audio and video signal in synchronization with the audio signal and the video signal. A port and MP information, wherein the MP information corresponds to a user ID.

Images