A memory system may include: a memory device including a plurality of pages having a plurality of memory cells coupled to a plurality of word lines and suitable for storing read data and write data requested from a host, a plurality of memory blocks each including the pages, a plurality of planes each including the memory blocks, and a plurality of memory chips each including the planes; and a controller suitable for searching map data of the read data corresponding to a read command received from the host on a basis of a plurality of segments, triggering memory chips corresponding to the map data searched through the searches of the respective segments, reading data stored in the triggered memory chips, and transferring the read data to the host.