Read and write operation method of nonvolatile memory device

Method of operating a nonvolatile memory device according to an embodiment of the present invention comprises the steps of: receiving a read command from the memory controller; Determining a read mode based on the received read command; Adjusting the charge time and the offset of the pre-charging control signal according to the determination result; And includes a pre-occupied by steps a plurality of bit lines of the sense bit line precharge voltage based on the precharge control signal conditioning, and detect the bit lines to be precharged according to the reading mode determination of a plurality of bit lines a bit line.