A hierarchical processing apparatus and method for video and audio data for producing, modifying or deleting a playlist formed from information of reproduction times, channels and so forth of programs in the form of video and audio data is disclosed. The hierarchical processing apparatus includes an...http://www.google.com.au/patents/US6441832?utm_source=gb-gplus-sharePatent US6441832 - Hierarchical processing apparatus and hierarchical processing method for video and audio data
