A storage system is provided with a plurality of interface units each for connection with a server; an interface unit for connection with hard disk drives; a plurality of microprocessor units each for processing commands; and a switch unit for interconnecting the interface units and microprocessor units. A management console is also connected to the storage system. The storage system forces the management console to select an unused interface unit from among the plurality of interface units for use in a data input/output process between the server and the storage system, select a microprocessor unit which meets required performance of the server from among the plurality of microprocessor units for use in the data input/output process, and notify the administrator of the selected interface unit and microprocessor unit.