in an audio / video synchronous reproducer for carrying out audio reproduction and video display synchronously in response to audio data and video data , an audio processing section processes the audio data to produce a processed audio data amount in addition to an audio reproduction control signal . based on the processed audio data amount , an audio time stamp deriving section derives an audio time stamp equivalent value . comparing the audio time stamp equivalent value with a video time stamp produced in a video processing section , a time stamp comparing section produces a comparison result signal indicative of a delayed / advanced relationship between the video data and the audio data . in response to the comparison result signal , a video control arrangement controls an operation of the video processing section .