A communication system that performs data communications based on an SCSI command defined in the SCSI standard, the communication system includes; a peripheral device that performs at least one of writing and reading to/from a recording medium inserted into a slot; and an information processing device connected to the peripheral device, including: an OS kernel; an adding unit that adds communication data to a free area of Inquiry data generated by issuing Inquiry command to the OS kernel; and a transmitting unit that transmits the Inquiry data to the peripheral device including the communication data added by the adding unit, wherein the peripheral device includes: a receiving unit that receives the Inquiry data transmitted by the transmitting unit; and an extracting unit that extracts the communication data added to the received Inquiry data.