Abstract: A detecting device includes: a verification information acquiring unit (400) configured to acquire second verification information about block data recorded in a central server that generates and distributes block data configuring a block chain and first verification information about block data recorded in a plurality of participant servers that record the distributed block data in a ledger of each of the plurality of participant servers; and a comparison unit (401) configured to determine the presence or absence of tampering of the block data in the central server by comparing the first verification information with the second verification information.

Abstract: An operation/maintenance management method of an integrated system including a plurality of components or devices includes selecting an index and a period for evaluating the integrated system, acquiring prediction information for input information for use in computation of the index, creating a future prediction scenario by combining the input information, computing an evaluation index related to the scenario, and comparing and displaying evaluation index computation results related to a plurality of scenarios.

Abstract: An operation/maintenance management method of an integrated system including a plurality of components or devices includes selecting an index and a period for evaluating the integrated system, acquiring prediction information for input information for use in computation of the index, creating a future prediction scenario by combining the input information, computing an evaluation index related to the scenario, and comparing and displaying evaluation index computation results related to a plurality of scenarios.