A disk control device includes a hypervisor, a cache access measurement unit, and a distribution determination unit. The cache access measurement unit measures a characteristic value of a logical disk by analyzing an access pattern to the logical disk by a cache memory. The distribution determination unit selects one of a plurality of virtual computers including the cache memory associated with the measured characteristic value. The hypervisor activates the virtual computer selected by the distribution determination unit and switches a forwarding destination of an input-output request to the logical disk to the virtual computer selected by the distribution determination unit.