Information record medium, and apparatus/method for reproducing/recording the same

摘要

An information record medium (1) is provided with: substantial information (VTS, ATS) including video information (VOB) and audio information (AOB) which are related to each other; first reproduction control information (VMG, PGCI) to simultaneously reproduce the video information and the audio information out of the substantial information; and second reproduction control information (AMG, APGCI) to reproduce only the audio information out of the substantial information.