1. A subject verification apparatus comprising: a camera for continuously photographing a plurality of subjects; a subject detector for detecting subject images of each of the subjects from a plurality of pieces of image information photographed by the camera; a subject tracker for tracking each of the subjects in a plurality of time intervals based on movement of the subject images corresponding to each of the subjects, thereby forming tracking information of each of the subjects; a tracking information storage for storing the tracking information of each of the subjects; a subject selector for selecting, in one of said time intervals, a subject to have identity verified, from the plurality of subjects, based on the tracking information stored in the tracking information storage, and for avoiding trying to have identity verified of another subject of said plurality of subjects in said one of said time intervals; and a verifier for verifying the identity of the subject selected by the subject selector based on visual identification of the subject.