Method and system for network communication

PURPOSE: To form a hierarchical network including multistage networks of plural levels by combining processors, memory systems, and a switching network. CONSTITUTION: Each processor 10 is provided with an input/output route 14, and each memory system 12 is provided with an input/output route 16. It is important that the processor 10 requiring the access to a specific memory system must have the input/output route 14 connected to the input/output route of this memory system 12. This selective connection is performed by a switching network 18. The user of cross point exchange of the switching network 18 supplies a required high band. The cross point exchange has an important characteristic that it can simultaneously selectively perform N connections from one side to the other. COPYRIGHT: (C)1990,JPO