Patent ID: 7814352

Claim:
A gateway card that is connected to an information processor and that receives and transmits data between different networks, the information processor having a normal power mode and a power saving mode, the gateway card comprising: a switching unit that connects a memory to either the information processor or the gateway card; and a switch control unit that controls the switching unit to connect the memory to the information processor so that the gateway card accesses the memory via the information processor when the information processor is in the normal power mode enabling the information processor to read or write data via the networks, and controls the switching unit to connect the memory to the gateway card when the normal power mode of the information processor is changed to the power saving mode, wherein the memory is partitioned into a first partition corresponding to the information processor and a second partition corresponding to the gateway card, the gateway card further comprising a valid-invalid unit that validates the first partition and invalidates the second partition when the information processor is in the normal power mode, and invalidates the first partition and validates the second partition when the normal power mode is changed to the power saving mode.