An information processing apparatus (2) includes: a reducing unit (211) that generates a second image (IMG2) by reducing a first image (MG1) in which a target object is included; a first extracting unit (212) that extracts, as a first key point, a key point (KP) of the target object from the second image; a setting unit (213) that sets a target area (TA) that designates a part of the first image based on the first key point; and a second extracting unit (214) that extracts, as a second key point, a key point of the target object from a target image (IMG1_TA) of the first image that is included in the target area.