Job starting processing and terminating processing of a printer is kept to the necessary minimum thereby to increase the efficiency of the printer. Print output is performed in accordance with print settings designated in print information, such as a print style of binding, the number of copies, and paper size, and a file output port, which is a characteristic of the present invention, is used as an output destination. An output print job file is sent to a common folder monitored by a job manager. The job manager executes scheduling operations at the time when the print job file is received in the common folder. The job manager also determines order characteristics, such as priority and quality, of the print job file, rearranges job schedules, and generates a stabilizing processing execution job when stabilizing processing is necessary.