1. A memory system, comprising: a nonvolatile memory device comprising a memory cell array comprising first and second memory blocks; and a memory controller configured to control the nonvolatile memory device to read data from the first memory block to a page buffer of the nonvolatile memory device, wherein the memory controller is configured to perform error correction operation for the data transferred from the nonvolatile memory device, and wherein the memory controller is further configured to skip to transfer the data in the memory controller into the nonvolatile memory device when an error bit number of the data does not exceed a reference value, and the data in the page buffer is programmed into the second memory block.