To solve problems that the processing becomes complicated and the required capacity of a memory is increased because buffer simulation is required in a conventional packet processing system.

By utilizing information of VBV delay of a picture included in a video stream and reproduction time information of an audio access unit included in an audio stream or the like buffer time information such as an SCR is obtained through the use of a calculation expression and in high-speed processing with a smaller memory capacity is attained by a simplified method.