Patent ID: 8515238

Claim:
A playback apparatus comprising: a video decoder operable decode a video stream, to obtain a moving picture; and a graphics decoder operable to decode a graphics stream, to obtain a menu presentation that is to be composited with the moving picture, wherein the graphics stream includes a plurality of Display Sets that constitute the menu presentation, and the graphics decoder includes: a composition buffer operable to store a composition segment, the composition segment including page information that corresponds to pages in the menu presentation; and a write control unit operable to when a new Display Set is read in accordance with progression of playback of the video stream, compare a page version number in each piece of page information in the read Display Set with a page version number in a corresponding piece of page information stored in the composition buffer, to detect whether contents of the piece of page information have been updated, and when contents of a piece of page information have been updated, use the updated piece of page information to overwrite the corresponding piece of page information in the composition buffer.