Non-volatile memory device, memory system and operating method thereof

Method of operating a nonvolatile memory device according to an embodiment of the present disclosure, while writing the first data in the first cell group of the memory cell array, to from outside the memory device, writing the second group of cells of the memory cell array to receive the second data, it may comprise the step of copying data stored in the input latches of the page buffer, the other latch of the page buffer. Method of operating a nonvolatile memory device according to an embodiment of the present disclosure, before the completion of the writing of the first data, it is possible to complete the reception of the second data.