PURPOSE: To display encoded picture data in real time.

CONSTITUTION: In the natural picture display system where a video signal is displayed in real time, a decoding and converting means 5 which converts taken-out luminance signal and color difference signals to three red, green, and blue primary color signals after taking out the luminance signal and color difference signals by decoding of inputted encoded picture data and a selecting means 4 which selects and sends the output signal of a video signal input part 2 or that of the decoding and converting means 5 to a display control part 3 in accordance with an applied select control signal are added, and encoded picture data is displayed in real time also when the select control signal indicates selection of the decoding and converting means 5.