A job including image data to be subjected to printing is transmitted from a user PC to an image forming apparatus. Upon execution of printing in the image forming apparatus, the image forming apparatus notifies the user PC of completion of printing. The image forming apparatus also saves the job subjected to printing after assigning an ID for saving to the job. A screen appears on the user PC to give notification of completion, with a button for giving an instruction for re-outputting. The user PC gives an instruction to re-output the job by pressing the button, so that the image forming apparatus does reprinting.