PURPOSE:To prevent a waste of resources and energy and to reduce the load on circumstances by operating and managing a city equipment system as the object based on operation and management information where mutual relations between city equipment systems are taken into consideration. CONSTITUTION:Each city equipment system has peculiar operation and management information 10 required for its operation and management and is provided with an information communication network means 11 which freely takes out operation and management information of the other city equipment system besides this individual operation and management information 10, an information integrated management means 12 which manages taken-out operation and management information correspondingly to information of the position where this information exists, and a common information extracting means 13 which takes out information common to operation and management information of its own system from operation and management information of respective city equipment systems. Common operation and management information of equipment management related to respective city equipment systems is used to control the operation and the management of each system in cooperation between related city equipment systems.
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