A switch connects and disconnects an input and output control device to and from an input and output device. The switch includes a storage unit that stores therein a translation table for use in translating a physical address used on a virtual machine that a guest operating system specifies as a direct memory access transfer destination to the input and output device, into a physical address used on a real machine; and an address translating unit that translates an address contained in a direct memory access request issued by the input and output device into a physical address used on the real machine by referring to the translation table.