PURPOSE: To attain ease of processing control by providing respectively a storage buffer to a memory device or to a set corresponding to the memory device to store request independently to each storage buffer by the storage request from a processing unit.

CONSTITUTION: The storage request from the processing unit 1 or 2 of an information processing system is applied to selectors 3, 4. The storage request of the selectors 3, 4 is fed to storage buffer devices 5, 6 and the storage request is stored sequentially in the buffer devices 5, 6. Memory controllers 7, 8 are connected corresponding to the buffer devices 5, 6, and when the devices 7, 8 are utilized, one of storage requests stored in the buffer devices 5, 6 is transmitted to the devices 7, 8 from lines 51 and 61. Then the buffer devices 5, 6 are provided respectively with write pointers 5a, 6a and read pointers 5b, 6b, the storage request is stored independently to simplify the processing control of the system.