In a server unit (300), a clock-time comparator (313) acquires the scheduled decoding clock-time information for decoding a video packet and RTT for transferring the video packet to a client unit (400) via a network and computes the time necessary for retransmitting the video packet on the basis of RTT....http://www.google.com/patents/US20050050424?utm_source=gb-gplus-sharePatent US20050050424 - Information processing device, its system, its method, its program, and recording medium storing the program