1. A storage managing system which manages a first storage subsystem which generates plural hierarchies using plural storage devices having different performances, configures a hierarchical pool using the hierarchies, and provides a virtual logical volume from the hierarchical pool, the storage managing system comprising: a memory for storing management information of a device file of a host server which manages access to a logical volume in a second storage subsystem different from the first storage subsystem and information concerning a configuration and a capacity of the hierarchies including the plural storage devices in the first storage subsystem; and a processor which reads out the management information of the device file and the information concerning the configuration and the capacity of the hierarchies from the memory and executes, on the basis of the read-out information, configuration candidate calculation processing for calculating a capacity of the logical volume and calculating a configuration candidate of the hierarchical pool for allocating storage regions for storing data included in the logical volume to the virtual logical volume and configuration candidate output processing for outputting the configuration candidate of the hierarchical pool obtained by the configuration calculation processing.