A memory management device enables to effectively use a memory which permits its stored data to be erased only in blocks. A facsimile apparatus is arranged to temporarily store sending information and received information in the memory and then to send or receive the information. The facsimile apparatus includes a flash memory whose data is allowed to be erased only in blocks and a storage unit for storing the sending or the received information in its own blocks if the sending or the received information is stored in the flash memory.