Abstract: A memory system may include a memory device including a plurality of planes each including a plurality of memory blocks; and a controller suitable for storing first and second command data corresponding to first and second commands in a first and a second sub-buffer of a buffer or one or more extra page buffers among page buffers included in the plurality of planes, respectively, according to a priority information and a size information of the first and second commands, and performing first and second command operations in response to the first and second commands, respectively.

Abstract: A memory system includes a memory device including a plurality of memory blocks; and a controller suitable for performing read and write operations respectively in response to read and write commands, and update map data, which is stored in a buffer, as a result of the operations according to priority information of data stored in the memory blocks.