Abstract: An information processing device includes a CL data acquiring unit for acquiring CL data including an instructed position of a tool leading end point and an instructed angle of a tool posture; and an NC program generating unit for calculating a movement position on the linear axis corresponding to the instructed position and a rotational position about the rotation axis corresponding to the instructed angle. The NC program generating unit generates (i) first instructed point data calculated with an initial value of the rotational position and (ii) second instructed point data, which is different from the first instructed point data, calculated with the initial value of the rotational position, and the NC program generating unit counts number of inversions of the rotational position for each of the first instructed point data and the second instructed point data and generates the NC program in which the number of inversions is smaller.