| 摘要 |
PROBLEM TO BE SOLVED: To enable a subsidiary sub-manager to economically realize vicarious execution management in the case of fault in a main sub-manager with a simple configuration and secure fault tolerance performance to the fault of the main sub-manager. SOLUTION: This system is provided with plural local area networks 1, 2 and 3 connected to a wide area network 5 and main sub-managers 11 and 12 which are connected to the local area networks 1, 2 and 3 having no redundant configuration. The plural subsidiary sub-managers 14 and 15 having the redundant configuration being smaller than that in the main sub-managers at the side of an integrated manager is allowed to vicariously execute the function of either one of the main sub-managers 11 and 12 where fault occurs.
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