A multifunction device has a plurality of functions. The multifunction device includes an input unit, a general-purpose process unit, a single specific process unit, and an output unit. The input unit receives image data. The general-purpose process unit implements a plurality of tasks for each of the plurality of functions. The plurality of tasks includes compression of the image data in a compression format and expansion of the image data which has been compressed. The single specific process unit is controlled by the general-purpose process unit. The specific process unit implements only two tasks, one task being compression of the image data in the compression format for each of the plurality of functions, the other task being expansion of the image data which has been compressed for each of the plurality of functions. The output unit outputs the image data. The general-purpose process unit determines which the general-purpose process unit or the specific processing unit should implement the compression/expansion.