Abstract: To provide editing processing that can shorten a data stream editing processing time. A data processor reads and writes content data from/on at least one unit area of a storage medium. A plurality of packets that store the content data are recorded on the unit area. The data processor includes: a reading section operable to read the packets; a control section operable to write the content data, which is stored in (n+1)th through (n+m)th packets (where n and m are integers that are equal to or greater than one), and storing the divided data on the first through (n+m)th packets; and a writing section operable to write a plurality of packets, including the first through (n+m)th packets, on the unit area.

Abstract: An information recording or reproduction apparatus and method in which a transport packet for padding is not inserted and a limited recording space is used effectively when performing data editing to delete a mid-stream of the moving picture file consisting of an MPEG transport stream and connect the remaining portions. A data portion preceding the deleted portion, a data portion immediately after the deleted potion, and the remaining data portion are recorded as three independent data files and information on the sequence between these data files is recorded together as a management file.