On an optical disk, video object sets (VTST_VOBS) to be reproduced and video
title
set information (VTSI) serving as management information on the video object sets
have been stored. In each video object set (VTST_VOBS), many data cells, each containing
video, audio, and sub-picture data, are arranged. Management information on programs
chains, which are combinations of programs to be reproduced one after another,
has been written in a video title set PGC table (VTS_PGCIT). By referring to the
program chain table (VTS_PGCIT) according to the user's input, the playback order
of the program chains can be changed, enabling the program chains to be reproduced
one after another in various modes.