COMMUNICATION SYSTEM, COMMUNICATION DEVICE, AND COMMUNICATION METHOD

PROBLEM TO BE SOLVED: To reduce the processing load of reception data on a CPU by only making network superordinate software of the CPU controlling a communication device process data necessary for its own device.SOLUTION: A communication device having received a transmission frame from another communication device determines whether or not the communication device should perform reception processing of the received frame by getting a reception frame discard determination means 439 to compare a destination IP address and destination port number as a destination number which is the information included in the received frame with a destination IP address and destination port number indicating whether or not the communication device may perform reception processing stored in a storage device in the communication device. A LAN controller driver 421 will perform discard processing of the frame if the received frame is not a frame of which the communication device should perform reception processing, and network superordinate software 411 will perform frame reception processing if the received frame is a frame of which the communication device should perform reception processing.