A memory system which includes a memory pool having a plurality of memory units and a controller suitable for controlling the plurality of memory units, wherein the controller includes a translation unit suitable for translating a system address into a local address within the memory pool, a threshold decision unit suitable for dynamically changing a threshold based on an a number of accesses to each local address for data within the memory pool, a data attribute determination unit suitable for determining an attribute of data associated with the translated local address based on the threshold and the number of accesses to the translated local address, and a data input/output unit suitable for controlling a memory unit associated with a new local address among the plurality memory units based on the attribute of the data.