A method for managing a plurality of blocks of a Flash memory includes: recording/updating linking information regarding a logical block address, wherein the linking information includes a plurality of physical block addresses linking to the logical block address, and each physical block address represents a block of the plurality of blocks; and when a block represented by a physical block address of the plurality of physical block addresses has no valid page, selectively erasing the block and removing the physical block address from the linking information, wherein when a number of blocks that are within blocks represented by the physical block addresses and have no valid page reaches a predetermined value, erasing all of the blocks that have no valid page and removing physical block addresses thereof from the linking information.