Upon copying data stored on a page in a copy source block of a nonvolatile memory to a page of a copy destination block, an access control unit of a memory controller copies data stored on a page associated with a first copy method to a page of the copy destination block after error correction by an error correction control unit copies data stored on a page associated with a second copy method to a page of the copy destination block without performing the error correction by the error correction control unit according to a copy mode stored in a copy mode storage area, and changes the copy mode associated with the copy destination block to a copy mode that is different from the copy mode of the copy source block.