To simply and suitably record/reproduce data by adjusting quality level of a moving picture and sound to be matched with the capacity of a recording medium.

A control processing part 6 sets quality level of the moving picture and sound to be recorded on an optical disk 1 to display the quality level in a display part 7. The control processing part 6 judges whether or not the displayed quality level have been agreed based on the instruction information inputted from a key entry part. When the quality level is judged as disagreed, the control processing part 6 specifies the quality level of the moving picture and sound to be recorded on the optical disk 1 based on the instruction information inputted from the key entry part 8. Then, the control processing part 6 specifies the quality level in the case of re-compressing the moving picture and sound already recorded on the optical disk 1 to display the specified level in the display part 7. When the quality level is agreed, a 2nd recording and reproduction processing part 5 changes the compression ratio of the data recorded on the optical disk 1 and records them again.