A non-volatile memory device performs a multi-page copyback operation where after a plurality of copyback data read out from one or more mats are sequentially stored in a plurality of buffers, the stored data are simultaneously programmed to different mats. The copyback data may be read out without limitation to the location of mats and the number of copyback data to be read out from the respective mats. The read-out copyback data are simultaneously programmed to a plurality of mats.