Example embodiments relate to an apparatus which may determine a length of data to be stored in a memory cell, and may store the data in a memory based on the determined length. A memory data storage apparatus according to example embodiments may, include: a determination unit that may determine a number of bits of data and a number of bits of data detection information to be stored in a memory cell; a data receiving unit that may receive data corresponding to the determined number of bits; an error correction coding unit that may perform an error correction coding with respect to the received data and generate data detection information corresponding to the number of bits of the data detection information; and a data storage unit that may store the received data and generated data detection information in the memory cell.