PURPOSE: To provide the network system which need not have dedicated communication software for each processing function without being aware of hardware and an operating system (OS) on the hardware.

CONSTITUTION: This network system features object-oriented application software programs 6 and 7, and 10 and 11 which perform task control only by sending and receiving messages in all nodes 2 and 3 connected to the network, and task control routers 5 and 9 in queue structure by the nodes which are stored with information showing which node the individual application software programs in all the nodes are present in and rearrange the order of task actuation messages according to priority information and queue and send the actuation messages according to the loads on the arithmetic units in the respective nodes.