In an image-forming apparatus such as a digital copying apparatus, even when a digital copying apparatus having print data desired by a user is used by someone else or is in trouble, the apparatus outputs the print data desired by the user without any delay at any time convenient to the user and in an output form the user desires, and thus increases availability thereof. The digital copying apparatus includes an network interface communicating with an external host apparatus, and a memory for storing image data and operation mode data received through the network interface, and prints out the image data on a printer section. The digital copying apparatus receives image data and operation mode data from the other digital copying apparatus and prints out the image data on the printer section thereof.