PURPOSE: To efficiently utilize various kinds of functions and data in plural function means by distributing control codes and data to pertinent function means based on the control codes from a host machine and transmission destination of data.

CONSTITUTION: A data packet becomes only a data part as it advances from a physical layer to an application layer, a pertinent unit ID designated for a header part, for instance, a PRN application 3 is judged and the whole of the packet is delivered to the unit via an internal bus 5. In each unit within a multi-image processing system, the original work of each unit can be continued without being turned around by the handling with a network. When the data packet is delivered to the specific work station on the network from each unit as the reverse flow of data, the making into a packet is performed and it is transmitted to the network by transmitting ID information arranged between a server, a multi-image processing system and a system control part to the server.