The present invention relates to a program provision device and method, and to a program provision device and method, which convert a processing program generated by means of a CAD program such that the movement of a tool is implemented on the route to which the tool nose radius of the tool is applied. A program provision device according to one embodiment of the present invention comprises: an input unit for receiving a processing program in which the tool nose radius of a tool used for lathe turning is not considered; and a program generation unit, which analyzes the processing program so as to generate a corrected processing program in which the tool nose radius of the tool is considered.