An object of the present invention is to prevent occurrence of data destruction when a transfer source region and a transfer destination region of data overlap with each other and even when transfer is performed using a burst transfer function. The data read from the transfer source region is temporarily written into a ring buffer, and then the data written into the ring buffer is written into the transfer source region. In this case, reading of the data from the ring buffer is controlled, based on a magnitude relation between the number of times of wrap-arounds caused by writing of the data into the ring buffer and the number of times of wrap-arounds caused by reading of the data from the ring buffer.