A control device according to an embodiment includes a first memory, a controller, a communication unit, and a second memory. The second memory stores a table with which an input area and an output area can be identified within the memory area. The controller sets the input areas to a first predetermined area in one transmission process based on the table when the first data is transmitted from a buffer area which a buffer memory has to the memory area, and sets the output areas to the first predetermined area in one transmission process based on the table when the first data is transmitted from the memory area to the buffer area.