A numerical controller includes a machining program creation unit for receiving an input of a machining program including a cycle command, a tool path creation unit for creating a plurality of tool paths based on the machining program, a display unit for displaying the machining program and the plurality of tool paths, and a correspondence relation management unit for recording a relation between an argument of the cycle command and the plurality of tool paths in an information table, wherein the correspondence relation management unit receives a selection of a selected tool path corresponding to one of the plurality of tool paths, and specifies an argument of the cycle command corresponding to the selected tool path with reference to the information table, and the display unit displays the specified argument in a different form from a form of another argument in the machining program.