A method for controlling a memory card which includes a nonvolatile semiconductor memory whose memory area includes a plurality of write areas is disclosed. A first area which is a part of the plurality of write areas is set in accordance with management executed by a first file system. The first file system sequentially writes data along a direction in which addresses of the plurality of write areas increase. A second area which is a part of the plurality of write areas is set in accordance with management executed by a second file system. The second file system writes data in an order which does not depend on the addresses.