A memory system may include a plurality of nonvolatile memory devices each including a plurality of memory blocks; and a controller configured to configure at least one memory block selected from the plurality of memory blocks as a super block, and to perform a read reclaim operation for the super block based on memory-block-read-counts of the super block, wherein the controller divides the super block into a plurality of page groups, selects at least one page group from the plurality of page groups based on the memory-block-read-counts, and performs the read reclaim operation.