A memory system may include: a memory device including a plurality of memory dies suitable for storing data; and a controller operatively coupled to the memory dies of the memory device via a plurality of channels, the controller may be suitable for checking the plurality of the channels, selecting independently best transmission channels and best reception channels among the plurality of the channels according to states of the channels, requesting performing of command operations corresponding to the commands through the best transmission channels to the memory dies, and receiving performance results of the command operations through the best reception channels from the memory dies.