1. An information processing device that optimizes, for an interference check, three-dimensional model data of a machine including a plurality of structures, the device comprising:a processor configured to:
execute a motion range demarcating unit that determines a three-dimensional motion range of the machine;
execute a check object selection unit that selects structures among the plurality of structures in the three-dimensional model data that overlap the determined three-dimensional motion range of the machine; and
execute a model creating unit that creates a modified three-dimensional model data from the selected structures.