data management information includes : recording time zone information at a time of recording data , indicating a time difference between the world standard time and a standard time in a location where the data of the group data for managing the data management information ; first data recording time information indicating a recording time of data first recorded on the data group ; and second data recording time information indicating a recording time of data last recorded on the data group , and wherein the reproduction apparatus further includes a unit for specifying respective local recording times in locations where the first recorded data and the last recorded data has been recorded , respectively , while the data is reproduced , in accordance with the first and second data recording time information , the time zone information , and the recording time zone information at the data recording time .