PURPOSE: To develope the decoded data edited in real time to a frame buffer by performing the write of the decoded data to a line buffer and the read of the data via a processor in parallel with each other with synchronization secured via a line synchronization control part for each line.

CONSTITUTION: The decoded data b1 outputted from a decoding part 2 is written into a line buffer 3 having a capacity equal to plural lines of the data b1 and also read out the buffer 3 to an editing processor 4 in parallel with each other for each line with synchronization secured via a line synchronization control part 5 for each line. The processor 4 applies the editing processes like a clipping process, etc., to the read data b1 for each line. This processed data is evolved to a frame buffer 6. Thus, it is possible to apply the editing processes including a clipping process, etc., to an original image at a high speed and in real time. Then the processed image can be developed to the buffer 6.