A digital multifunction peripheral has a copy mode for printing an image scanned by a scanner on a sheet using a printer, a network scan mode for transmitting the image scanned by the scanner to an external apparatus through a network interface, and a facsimile mode for transmitting by facsimile the image scanned by the scanner through a facsimile interface. The digital multifunction peripheral erases the same area from image data as an area on the outside of an original document image irrespective of processing contents in plural image processing units that subject the image scanned by the scanner to image processing according to operation modes. The digital multifunction peripheral performs processing corresponding to an operation mode using image data from which the area on the outside of the original document image is erased and that is processed by the image processing unit corresponding to the operation mode.