Flash memory device and data manage method thererof

PURPOSE: A flash memory device and a data management method thereof are provided to minimize the time consumption of data compression and decompression while efficiently using a storage area of the flash memory. CONSTITUTION: Cold data is collected in a volatile memory from data stored in a flash memory based on a cold list table(S230). The cold data is compressed and stored in the flash memory(S250). A page including the cold data is inactivated after the cold data is collected in the volatile memory. If all pages in a block including the inactivated page are inactivated, removal operation is performed to the block including the inactivated page.