PURPOSE: To automatically switch used system resources after checking the suitability of the switching in the multicomputer system of a called standby system.

CONSTITUTION: When a fault is generated at a counter computer (1 or 2) as a working system computer, a start control means 20 or 10 judges the suitability of switching the used system resources (MT devices 4-1-4-4 in this case) and when it is suitable, a switching request for switching the used system resources is issued to the own computer (2 or 1) as a standby system computer. Based on the switching request from the start control means 20 or 10, resource switching devices (MT switching devices 3-1 and 3-2 in this case) switch the connection of the used system resources from the working system computer to the standby system computer.