1. A storage system, comprising: a host computer; a memory device; a plurality of resources for allocating a storage area of the memory device in response to an access request from the host computer; a memory for storing a correspondence relationship between the plurality of resources based on information concerning performance of the plurality of resources and configuration information including a performance correlation among the plurality of resources; an input module for selecting and inputting a prescribed resource among the plurality of resources; and a performance correlation management module for extracting, by referring to the configuration information of the prescribed resource selected by an input to the input module, all other related resources having performance correlations with the prescribed resource; and then determining, by using the information concerning the performance of the extracted all other related resources and the selected prescribed resource, whether there is a performance correlation between the resources and identifying one or more resources having a correlation; an output module for outputting and displaying, on a screen, configuration information which is created by adding the other resources identified by the performance correlation management module to the selected prescribed resource; and a controller for making the performance correlation management module execute determination processing and making the output module execute output and display processing.