To execute, even when a sheet subjected to post-processing after printing cannot be conveyed through a bookbinding device, from printing to bookbinding of printed matter including a sheet to be subjected to post-processing after printing as a series of treatment.

A printer 20 acquires print data including a post-processing unnecessary page which does not need post-processing after print processing and before bookbinding processing and a post-processing necessary page which needs the post-processing to perform printing. A bookbinding device 30 accumulates a sheet with the post-processing unnecessary page being printed thereon based on the print data in an accumulation tray 310. A post-processing device 40 performs post-processing on the sheet with the post-processing necessary page being printed thereon based on the print data, and accumulates the sheet subjected to post-processing in a post-processing output tray 410. The bookbinding device 30 executes bookbinding processing after the sheets accumulated in the accumulation tray 310 and the sheet accumulated in the post-processing output tray 410 are accumulated in the accumulation tray 310 in a predetermined order.