In a secured printing system including an information processing apparatus and a printer, when the information processing apparatus issues a print job in a suspended state to the printer, the printer having accepted the print job suspends and holds the print job until release of suspension of job is instructed, and returns job designation information peculiar to the accepted print job to the information processing apparatus. The information processing apparatus writes the job designation information returned from the printer in a detachable storage medium. The printer reads out the job designation information from the detachable storage medium, in which the job designation information is written, and, then, releases the suspended state of the corresponding print job.