fixed period of time the reproduction mechanism 206 receives a clock from the usb controller 204 and then reads out reproduction data from the reproduced data buffer 207 to convert the read out reproduction data into a video signal and an audio signal the reproduction mechanism 206 then outputs the converted video signal and the audio signal to the video output apparatus 203 and the audio output apparatus 205 respectively the video output apparatus 203 outputs the video signal received from the reproduction mechanism 206 as an image the audio output apparatus 205 outputs the audio signal received from the reproduction mechanism 206 as a sound in the following the operation of the audio storing memory monitoring setting apparatus 106 will be described fig4 is a view showing the surrounding configuration of the audio storing memory 105 the audio storing memory 105 is of the ring buffer system and holds a data read out position address r and a data write position w in a fixed memory area at the time of data writing subject data is written at the data write position w and the data write position is shifted backward moreover at the time of data reading data is read out from the data read out position r and the data read out position r is shifted backward when both of the data write position w and the data read out position r reach the rearmost position of the memory area the data write position w and the data read out position r are returned to the top of the memory area the above mentioned circulations of the data write position w and the data read out position r in the fixed memory area realizes the buffer of.