1. A same person determination device, comprising: a processor configured to: calculate, as a first feature amount calculation device, a feature amount of each of a plurality of faces from one image in which the plurality of faces are included; compare, as a feature amount comparison device, the feature amount of each face calculated from the one image by the first feature amount calculation device with a feature amount of each of a plurality of faces included in another image different from the one image; determine, as a person determination device, a first relationship in which a feature amount of one face calculated from the one image approximates to a feature amount of one face obtained from the other image; determine, as the person determination device, a second relationship in which the feature amount of the one face calculated from the one image does not approximate to feature amounts of all other faces other than the one face obtained from the other image; and determine, as the person determination device, that the one face included in the one image and the one face included in the other image are a face of the same person based on the first relationship and the second relationship, the first and second relationships being obtained from the one image and the other image through the comparison in the feature amount comparison device.