Irrespective of operation mode of systems in which predetermined axes belong to, a multi-system numerical controller is provided that freely combines axes belonging to arbitrary systems, and then simultaneously operates axes belonging to a plurality of systems in a predetermined manual mode, or simultaneously operates a plurality of axes belonging to the same system in respective manual operation modes so as to safely take interpolation control in manual operation. The numerical control apparatus includes a plurality of manual operation controllers and independent of the systems; a manual-operation-mode selecting signal provided each for the manual operation controllers; an arbitrary-axis selection signal, provided each for the manual operation controllers or manual modes, for selecting axes from any of the systems; a manual-move-speed instructing signal provided each for the manual operation controller; a manual operation reset signal provided each for the manual operation controllers.