| 摘要 |
In an embodiment of this invention, a diagnosis engine (40) refers to a risk assessment DB (22) and anti-risk measure DB (21), calculates along the time sequence a risk estimate amount in case of failure for each device and a maintenance cost in executing a measure method in advance, and adds the risk estimate amount and maintenance cost along the time sequence to calculate an optimum maintenance period of the device. When a failure has occurred in the device, the diagnosis engine (40) refers to a failure diagnosis DB (23) on the basis of the identification information of the device and the failure mode and analyzes, on the basis of an operation record, a failure which is different from a secular change. <IMAGE>
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