To enable the analysis of the most important shared risk from the point of view of the degree of influence on the service. For each share risk factors on the system, and share risk management unit that manages the information of the equipment and applications that share risk factors influence, and the device characteristics management unit that manages information about the characteristics of the equipment and applications , for each service provided by the system, equipment and applications that provide and service characteristics management unit that manages the information of the applications needed to provide the services, the degree of influence on the system of each share risk factors, the impact is shared risk factors comprising the information, and a influence degree calculating section for calculating, based on the information of the application needed to provide services.
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