An error correction code processing method includes performing a first encoding operation for a data group of a first direction; performing a second encoding operation for a data group of a second direction, wherein the data group of the first direction shares one or more data with the data group of the second direction; performing a first decoding operation of correcting an error included in the data group of the first direction; and performing a second decoding operation of correcting an error included in the data group of the second direction when the first decoding operation fails.