Controller of nonvolatile memory device and command scheduling method thereof

The present invention relates to a controller of a non-volatile memory device and a command scheduling method thereof. The controller of the present invention comprises: a command scheduler which relocates commands provided from a host based on a logic block address; and a working memory which selectively loads one mapping table from a mapping table array, wherein the working memory selects the one mapping table in response to the logic block address of the relocated commands from the command scheduler. According to the controller of the non-volatile memory device and the command scheduling method thereof, a time for table switching is reduced and an operation speed is improved.