At least one embodiment of a post-processing apparatus performs post-processing on a product printed by a printing apparatus, and transmits, to the printing apparatus, instruction information instructing the printing apparatus to perform print processing for a first job preferentially. At least one embodiment of the printing apparatus receives, from the post-processing apparatus, the instruction information instructing the printing apparatus to perform the print processing for the first job preferentially, and performs control so as to perform the print processing for the first job preferentially over print processing for a second job, based on the instruction information.