Patent ID: 8189991

Claim:
A reproduction apparatus for reproducing an optical disk recording medium recorded with data management information for managing data as a data group including one or a plurality of data of N (N is an integer) pieces of data, and total management information for managing M (M is an integer) pieces of the data group, wherein the total management information includes time zone information (TM_ZONE) indicating a time difference between a world standard time (Greenwich Mean Time) and a standard time in a predetermined location, wherein the data management information includes: recording time zone information (REC_TM_ZONE) at a time of recording data, indicating a time difference between the world standard time (Greenwich Mean Time) and a standard time in a location where the data of the group data for managing the data management information have been recorded; first data recording time information indicating a recording time of data first recorded on the data group in accordance with the standard time indicated by the time zone information (TM_ZONE); second data recording time information indicating a recording time of data last recorded on the data group in accordance with the standard time indicated by the time zone information (TM_ZONE); and a flag indicating whether the recording time zone information (REC_TM_ZONE) at the time of recording the data specifies a time difference from the world standard time (Greenwich Mean Time) at the data recording time, wherein the reproduction apparatus further includes specifying means for specifying a local recording time in a location where the data has been recorded, while the data is reproduced, in accordance with the first and second data recording time information, the time zone information (TM_ZONE) and the recording time zone information (REC_TM_ZONE) at the data recording time, and wherein the specifying means specifies the time difference from the world standard time (Greenwich Mean Time) in the location where the data has been recorded, in only a case where the flag indicates that the recording time zone information (REC_TM_ZONE) at the data recording time specifies the time difference from the world standard time (Greenwich Mean Time) in the location where the data has been recorded.