An NC program generating and editing apparatus configured to update basic data in accordance with the contents of editing when editing of an NC program is related to only a preset NC code is provided.
An NC program generating and editing apparatus 2 includes an interactive input unit 9, a basic data storage unit 10, an NC program generation unit 11, a program storage unit 12, a program editing unit 13, a change check unit 14 and a data update unit 15. The change check unit 14 determines whether a changed portion of an edited NC program consists of only a change related to a preset NC code, and when the changed portion consists of only a change related to the NC code, corresponding basic data is updated by the data update unit 15.