Memory system and oepration method for the same

The present disclosure relates to a memory system including a non-volatile memory device and a method of operating the memory system. The memory system includes a nonvolatile memory device, and a controller which includes first and second interfaces for inputting/outputting data from/to the host and inputting/outputting data inputted/outputted from/to a volatile memory device to the host by using one of the first and second interfaces according to a result of checking the durability of the non-volatile memory device. The use of the non-volatile memory device can be changed based on the durability variation of the non-volatile memory device.