PROBLEM TO BE SOLVED: To provide an output of an excellent audio signal synchronously with an image even when compressed video data are used and reproduced at a high speed. ;SOLUTION: A multiplex processing section 14 multiplexes a packet of audio data with a presentation time stamp PTS equivalent to a time between a PTS of an I picture and a PTS of a succeeding picture so that the packet is inserted between packets of the I picture. A demultiplexer processing section 19 demultiplexes the audio data with the PTS equivalent to a time between a PTS of an I picture and a PTS of a succeeding picture and read from a disk drive 16 and provides an output of the audio data to an audio signal expansion processing section 21.;COPYRIGHT: (C)1999,JPO
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