PURPOSE: To discriminate an intermediate node from the final reception node and to transmit data on a mesh type network smoothly by noticing only a node directly adjacent to each node at the communication between nodes and setting up node addresses and a global address.

CONSTITUTION: Plural nodes 1 of the mesh type network are connected like a mesh through a bi-directional common transmission line 2. Each node 1 is provided with a processor CPU 11 collectively controlling each part in the node 1 and a memory part 12 stores various data and programs. The CPU 11 and the memory part 12 are connected by an address bus 14 and a data bus 13, and transmitting/receiving parts 90∼90M transmitting/receiving with an opposite node directly connected with the node 1 are connected to the bus 13. The transmitting/receiving parts 90∼90M are respectively provided with DMA controlling parts 10∼10M connected to the bus 14. Subsequently, node addresses and a global address are set up to discriminate the intermediate node from the final reception node, so that data on the mesh type network are smoothly transmitted.