The present invention provides a processing apparatus that includes: an image acquisition unit that acquires a face image to be processed in which a face of a person to be identified is included; a computing unit that computes an identification score between each of a plurality of reference face images registered in advance in association with visitor identification information and the face image to be processed; a display control unit that displays the plurality of reference face images of which the identification scores satisfy a predetermined condition on a display unit as candidates, and displays the reference face image having the highest identification score in a discriminable manner; a selection information acquisition unit that acquires selection information indicating one reference face image selected by a user input from among the reference face images displayed as the candidates; and a registration unit that registers information indicating a fact that the reference image is selected, in association with the visitor identification information which is associated with the selected reference face image.