A packet switch device for a message exchange among a plurality of computing devices, including a message transceiver transmitting and receiving a message, a transmission table storage unit storing a transmission table for determining a computing device to which the message is transmitted, a transmission processor determining the computing device to which the message is transmitted based on a topic address included in the message, a reference processing information receiver receiving a usage status that indicates information used in a calculation process in the computing device, a transmission table compatibility calculation unit calculating compatibility of the transmission table based on the received reference processing information, and a transmission table update unit that updates the transmission table based on the calculated compatibility.