Patent ID: 7950039

Claim:
A multimedia data transmitting apparatus which transmits stored multimedia data to a multimedia data receiving apparatus via a network in response to a transmission request from the multimedia data receiving apparatus, said multimedia data transmitting apparatus comprising: a storage in which the multimedia data and an update-point information of a stream included in the multimedia data are stored; a request receiver that receives, from the multimedia data receiving apparatus, a transmission request message, the transmission request message requesting transmission of the multimedia data and transmission of the update-point information of the stream included in the multimedia data which are stored in said storage; an update-point information obtainer that obtains the update-point information of the stream, from the stream included in the multimedia data stored in said storage; and an information transmitter that transmits requested multimedia data and the update-point information of the stream included in the multimedia data, to the multimedia data receiving apparatus, wherein the update-point information of the stream includes update details of first data representing a structure of the stream included in the multimedia data and one of position information indicating a position in the stream at which the update details of the first data become valid and time information indicating a time in the stream at which the update details of the first data become valid, and wherein, when the request receiver receives the transmission request message specifying a reproduction speed that is faster than a specified reproduction speed, said information transmitter: transmits, to the multimedia data receiving apparatus, portions of the stream included in the multimedia data, as a stream that is required for reproduction according to the reproduction speed that is faster than the specified reproduction speed; and transmits the update-point information of the stream included in the multimedia data, when the reproduction speed specified in the transmission request message for the multimedia data becomes the specified reproduction speed.