A print management unit attaches an identifier to print data that goes through a custom processing unit functioning by execution of a custom class driver, and delivers the print data with the identifier attached, to a standard print control unit. The custom processing unit deletes the identifier from the print data delivered from the standard print control unit and customizes processing of causing a printer to execute printing, based on the print data. The print management unit detects a read state of the custom class driver by execution of an OS. When the read state indicates a failure in reading the custom class driver, the print management unit delivers the print data without the identifier attached, to the standard print control unit, and thus causes the printer to execute the printing that is limited via a standard communication control unit or to stop the printing.