An articulation region display apparatus includes: an articulatedness calculating unit calculating an articulatedness, based on a temporal change in a point-to-point distance and a temporal change in a geodetic distance between given trajectories; an articulation detecting unit detecting, as an articulation region, a region corresponding to a first trajectory based on the articulatedness between the trajectories, the first trajectory being in a state where the regions corresponding to the first trajectory and a second trajectory are present on the same rigid body, the regions corresponding to the first trajectory and third trajectory are present on the same rigid body, and the region corresponding to the second trajectory is connected with the region corresponding to the third trajectory via the same joint; and a display control unit transforming the articulation region into a form visually recognized by a user, and output the transformed articulation region.