A moving picture processing apparatus in which a buffer residual amount of a buffer module which buffers a plurality of image data which are inputted from the outside is monitored by a storing media control module and a decimation is performed at a decimation ratio which differs every image data, in accordance with the buffer residual amount of the buffer module and in accordance with the frame rate of each of the plurality of image data, so that it can be prevented the inconvenience that a period of time during which the image data is not recorded and cannot be reproduced occurs for a long time.