The numerical controller of the invention receives input of a technique for operating a plurality of tools and an operation condition of the operation technique, calculates movement command data including speed information and position information on the plurality of tools, such that respective cutting paths of the plurality of tools intersect, based on the input operation method and operation condition, generates interpolation data based on the movement command data, and controls a motor for driving a machine based on the interpolation data.

A curve fitting method, apparatus and device based on a drawing tool for improving the accuracy of curve fitting. The method includes: determining a fitting area containing the original curve, in the fitting area, performing at least one sub-fitting operation on the original curve until the end condition of the curve fitting is satisfied, and generating a fitting curve corresponding to the original curve based on the fitting curve corresponding to each sub-fitting operation. This method can fit the original curve segments in the fitting area, which improves the accuracy of the obtained fitting curve.