A memory system may include: a memory device storing data and including a memory interface in communication with a memory controller; and the memory controller controlling the memory device and including a controller interface in communication with the memory device, and, wherein, when the memory device is inaccessible, the memory controller requests a current state information including current operation mode of the memory interface from the memory device, and changes an operation mode of the controller interface to match the current operation mode of the memory interface according to the current state information received from the memory device.