The invention relates to an optical device, a reproduction device, a program, and a reproduction method, belonging to the technical field of slideshow play reproduction. The Browsable SlideShow is recorded on a BD-ROM. The Browsable SlideShow includes a video stream, an audio stream and PlayList information. The video stream and the audio stream are recorded on separate areas on an optical disc. The PlayList information includes a plurality of pieces of PlayItem information, each of which has an In_time and an Out_time which specify a single piece of picture data in the video stream and a Still_time indicating a period during which the piece of picture data is still-displayed. A still period indicated by the Still_time is a length of time that is longer than or equal to a VBV-delay when reading a subsequent piece of picture data to an Elementary Buffer 5 of a playback apparatus. The VBV-delay is based on the time required for seeking between the separate areas and reading the audio stream.