To provide a numerical control method and a processing device capable of generating a plurality of machine-specific machining programs, from one machining program to a single workpiece. A numerical control method is to be executed by a computer. The numerical control method includes a generating step of dividing, into a plurality of paths, a machining path of an original NC program for a machine configured to machine a single workpiece, corresponding to contents of machining to the workpiece in the original NC program, and of generating, on the basis of the respective divided machining paths, individual NC programs for machines corresponding to the respective machining paths.