Patent ID: 6965727

Claim:
An information record medium comprising: an audio information recording area on which a plurality of audio information are recorded; and a control information recording area on which control information to reproduce the audio information is recorded, wherein the control information includes first division information for identifying a first division unit, second division information for identifying a plurality of second division units by dividing a plurality of audio information as a reproduction unit, and management information for correlating the first division unit and the plurality of second division units with each other so that the plurality of second division units are associated with the first division unit, wherein the plurality of second division units comprise at least a first type of second division unit which has audio information associated with a first recording method and a second type of second division unit which has audio information associated with a second recording method, and the first type of second division unit and the second type of second division unit include the same content, and the first type of second division unit and the second type of second division unit are each contiguously recorded on the information record medium, and wherein the first type of second division unit and the second type of second division unit are recorded at different positions on the audio information recording area.