Patent ID: 7681221

Claim:
A communication apparatus comprising: a receiver for receiving plural sets of operation data obtained by a plurality of users for dynamic data played back by playback apparatuses; a storage device for storing the plural sets of operation data received by said receiver; a generator for generating digest information of the dynamic data according to the plural sets of operation data stored in said storage device; and a transmitter for transmitting the digest information generated by said generator to at least one playback apparatus, wherein said receiver receives playback-portion identification information indicating a playback portion of the dynamic data played back by the playback apparatus, wherein said generator comprises a statistical processor for accumulating playback times of the playback portion based on the playback-portion identification information received by said receiver, and generates the digest information based on an accumulation result obtained by said statistical processor, and wherein the generated digest information is stored in classified databases corresponding to titles, personal information, and playback-time zones.