1. A storage system, comprising: a host computer; a memory device; a plurality of resources for allocating a storage area of the memory device to an access from the host computer; a memory for storing a correspondence relationship of the plurality of resources; an input module to be used by an administrator for selecting a prescribed resource among the plurality of resources; and a controller for extracting other resources related to the selected resource by using the correspondence relationship, detecting the performance status of the extracted other resources, identifying a related resource having a correlation with the performance of the selected resource among the other resources based on the detection result, and causing an output module to output the association of the selected resource and the related resource.