Memory system including mlc flash memory

The present invention relates to a memory system including a flash memory for storing multi-bit data to the memory cells. Memory system according to the present invention is a flash memory for storing multi-bit data in one memory cell; And a memory controller for controlling the flash memory, the multi-bit data to program the memory cell. The flash memory programs the memory cell in the same program for operating the multi-bit data. The memory system according to the invention is one of the logical page is assigned to one physical page. However, the present invention can obtain the same results as a plurality of logical pages to one physical page allocation. According to the present invention, the greater the number of data bits to program one memory cell and the data reliability is significantly increased compared to the prior art.