The image forming apparatus 2 is a printing apparatus such as a printer for receiving the job from the image processing apparatus 1 to edit and develop the printing data contained in the job and to output the printing data as the printing image, and has a communicator 2-1, a reception buffer 2-2, an editor 2-3, a page buffer 2-4, a development section 2-5, a raster buffer 2-6, a received data stor