Patent ID: 8782720

Claim:
A content synchronization method for providing a receiving terminal with content of a sending terminal in a system that includes the sending terminal, the receiving terminal and a server to provide content to the sending terminal and the receiving terminal, comprising: receiving, at the server, a session request message from the receiving terminal to request the sending terminal to provide content, that is currently being played back at the sending terminal, to the receiving terminal; receiving, at the server, session information including identification information of the content, a content playback point at the time of transmitting the session information, and session information transmission point information from the sending terminal; calculating a first content playback start time point by adding a transmission delay time to a content playback time point of the sending terminal at the time of transmitting the session information that is included in the session information, the transmission delay time including a session information delivery delay time taken by the session information to be transmitted from the sending terminal to the receiving terminal and a content request message delivery time taken by the content request message to be transmitted from the receiving terminal to the server to request the content calculating, at the receiving terminal, a second content playback start time point by adding a content delivery time taken by the content to be transmitted from the server to the first content playback start time point; and playing back, at the receiving terminal, the content at the second content playback start time point.