Abstract: A method for transmitting voice data is provided. The method may include receiving voice data of a particular speaker from a voice data collection server; determining whether destination terminals are first-type terminals; and based on a determination that the destination terminals are the first-type terminals, transmitting the received voice data to the destination terminals through a channel corresponding to the particular speaker, from among a plurality of predefined channels for the destination terminals.

Abstract: An apparatus for managing an online conference according to one embodiment includes a group identification information receiver configured to receive group identification information regarding an offline conference room from a user terminal of a user who intends to attend an online conference in the offline conference room, an online conference identifier configured to identify an online conference connected to the offline conference room based on the received group identification information, and an online conference manager configured to transmit online conference entry information for attending the identified online conference to the user terminal.

Abstract: A computing device according to an embodiment includes one or more processors, a memory in which one or more programs to be executed by the one or more processors are stored, a network information manager configured to transmit a peer-to-peer (P2P) network information of the computing device and network quality information at the time of connection of the computing device to a management server, and a network monitor configured to generate network quality information by measuring a network quality at the time of connection of the computing device.

Abstract: A method performed by a computing device for controlling a P2P connection according to an embodiment of the present disclosure includes obtaining network information of a current path for transmitting and receiving data, calculating requested data quality of the current path by using the network information, and changing a network path to an alternative path by using previously stored data quality history information of the alternative path when a difference between a predetermined highest data quality and the requested data quality of the current path is equal to or greater than a reference value.

Abstract: A data transmission method according to an embodiment is performed by a computing device including one or more processors and a memory in which one or more programs to be executed by the one or more processors are stored. The data transmission method includes receiving, from connected client devices, peer-to-peer (P2P) network information of the client devices, extracting one or more of information on whether network access is successful and network quality information, which are matched with the P2P network information and pre-stored, and determining one of a first data transmission path and a second data transmission path as a data transmission path for the client devices based on one or more of the information on whether network access is successful and the network quality information.

Abstract: A method performed by a computing device for controlling a P2P connection according to an embodiment of the present disclosure includes obtaining network information of a current path for transmitting and receiving data, calculating requested data quality of the current path by using the network information, and changing a network path to an alternative path by using previously stored data quality history information of the alternative path when a difference between a predetermined highest data quality and the requested data quality of the current path is equal to or greater than a reference value.

Abstract: A method according to an aspect of the disclosure is performed by a computing device and includes rendering a video frame, displaying an object generated by user manipulation on the rendered video frame, calculating a relative position of the object with respect to a reference point of the video frame, and transmitting object information generated based on the relative position of the object. According to the method, even if the streaming screen continuously changes when streaming video between remote terminals, the shared 3D object can be placed at an accurate position, and objective position information of the shared 3D object can be provided regardless of the surrounding environment or situation.

Abstract: A method according to an aspect of the disclosure is performed by a computing device and includes rendering a video frame, displaying an object generated by user manipulation on the rendered video frame, calculating a relative position of the object with respect to a reference point of the video frame, and transmitting object information generated based on the relative position of the object. According to the method, even if the streaming screen continuously changes when streaming video between remote terminals, the shared 3D object can be placed at an accurate position, and objective position information of the shared 3D object can be provided regardless of the surrounding environment or situation.

Abstract: An apparatus for managing an online conference according to one embodiment includes a group identification information receiver configured to receive group identification information regarding an offline conference room from a user terminal of a user who intends to attend an online conference in the offline conference room, an online conference identifier configured to identify an online conference connected to the offline conference room based on the received group identification information, and an online conference manager configured to transmit online conference entry information for attending the identified online conference to the user terminal.

Abstract: A data transmission method according to an embodiment is performed by a computing device including one or more processors and a memory in which one or more programs to be executed by the one or more processors are stored. The data transmission method includes receiving, from connected client devices, peer-to-peer (P2P) network information of the client devices, extracting one or more of information on whether network access is successful and network quality information, which are matched with the P2P network information and pre-stored, and determining one of a first data transmission path and a second data transmission path as a data transmission path for the client devices based on one or more of the information on whether network access is successful and the network quality information.

Abstract: Methods for providing conference service and apparatus thereof are provided, one of methods comprises, receiving identification information of a first user and identification information of a first terminal of the first user from the first terminal of the first terminal, receiving identification information of the first user and identification information of a second terminal of the first user from the second terminal of the first terminal, transmitting first contents to the first terminal of the first user and receiving at least one first reaction information about the first contents from the second terminal of the first user.

Abstract: Provided are a method of synchronizing state information, the method comprises receiving first state information from a first terminal among a plurality of terminals, setting first synchronization identification information in the received first state information, transmitting the first state information and the first synchronization identification information set in the first state information to the terminals, receiving second state information and second synchronization identification information set in the second state information from a second terminal among the terminals, determining whether the received second state information is a synchronization target by judging whether the received first synchronization identification information matches the received second synchronization identification information and not transmitting the received second state information to the terminals when determining that the received second state information is not the synchronization target.

Abstract: Provided is a quality-of-service (QoS)-guaranteed video stream method. The QoS-guaranteed video stream method includes transmitting, by a transmitting server, a video stream including different video stream data for a plurality of respective layers, to a relay server, receiving, by the transmitting server, first section network state information which is information about a network state between the relay server and the transmitting server, from the relay server, receiving, by the transmitting server, second section network state information which is information about a network state between the plurality of respective user terminals and the transmitting server, and adjusting, by the transmitting server, qualities of video streams which are transmitted to the plurality of respective user terminals through the relay server by using network state information of the first section and network state information of the second section.

Abstract: Provided are a method of synchronizing state information, the method comprises receiving first state information from a first terminal among a plurality of terminals, setting first synchronization identification information in the received first state information, transmitting the first state information and the first synchronization identification information set in the first state information to the terminals, receiving second state information and second synchronization identification information set in the second state information from a second terminal among the terminals, determining whether the received second state information is a synchronization target by judging whether the received first synchronization identification information matches the received second synchronization identification information and not transmitting the received second state information to the terminals when determining that the received second state information is not the synchronization target.

Abstract: Methods for providing conference service and apparatus thereof are provided, one of methods comprises, receiving identification information of a first user and identification information of a first terminal of the first user from the first terminal of the first terminal, receiving identification information of the first user and identification information of a second terminal of the first user from the second terminal of the first terminal, transmitting first contents to the first terminal of the first user and receiving at least one first reaction information about the first contents from the second terminal of the first user.

Abstract: Provided are a system and method for transmitting and receiving Session Initiation Protocol (SIP) messages. The system includes user equipment (UE) including an SIP client configured to generate an SIP message, and an external transport configured to receive the SIP message from the SIP client, generate a packet by combining a tunneling header with the received SIP message, and transmit the generated packet to an SIP broker server, and the SIP broker server configured to receive the packet from the external transport in the UE, remove the tunneling header from the packet, and transmit the SIP message from which the tunneling header has been removed to a communication counterpart.

Abstract: There is provided a method of switching from multipoint communication to point-to-point communication while a device performs the multipoint communication with a plurality of participant devices. The method comprises: sharing, by the device, peer-to-peer (P2P) connection information of the device and P2P connection information of each of the plurality of participant devices, with the plurality of participant devices; and switching by the device, from the multipoint communication to the point-to-point communication using the P2P connection information of remaining participant devices of the plurality of participant devices in the multipoint communication when a total number of the remaining participant devices of the multipoint communication decreases to two.

Abstract: Provided are a system and method for a video call. The system for a video call includes one or more terminals configured to transmit images obtained by capturing video call users, and a video call control server configured to generate a combined image by combining the images transmitted by the one or more terminals, and transmit the combined image to the terminals. Here, the respective images are rotated according to information on orientations sensed by the terminals, and combined into the combined image.

Abstract: Provided is a quality-of-service (QoS)-guaranteed video stream method. The QoS-guaranteed video stream method includes transmitting, by a transmitting server, a video stream including different video stream data for a plurality of respective layers, to a relay server, receiving, by the transmitting server, first section network state information which is information about a network state between the relay server and the transmitting server, from the relay server, receiving, by the transmitting server, second section network state information which is information about a network state between the plurality of respective user terminals and the transmitting server, and adjusting, by the transmitting server, qualities of video streams which are transmitted to the plurality of respective user terminals through the relay server by using network state information of the first section and network state information of the second section.

Abstract: Provided are a data transmission system and method of using a relay server. In the data transmission method using the relay server, the relay server transmits a registration result message to a client after registering the client through a registration packet when the client transmits the registration packet to the relay server. The relay server transmits registration information of the client to a location server. The location server stores client registration information according to each client.