A management computer communicates with a host computer and a storage device, and is provided with a memory and a CPU. The memory stores configuration information which includes information about a plurality of storage media having different performance levels provided in the host computer and the storage device, and which associates storage regions provided by the storage media with the host computer. If the CPU receives a request for allocation of a storage region to the host computer, and which includes information about access characteristics of the host computer and the capacity of the storage region to be allocated, the CPU refers to the configuration information, selects a storage medium that provides a storage region having the requested capacity, from among the storage media and the host computer, and generates and outputs a configuration scheme for allocating a storage region from the selected storage medium to the host computer.