1. A scene switching point detector comprising: a feature-information generating unit that sets frames at every fixed time of an input video signal as target frames and generates feature information indicating a feature of each of the target frames; a backward-similarity calculating unit that sets each of the target frames as a similarity calculation frame in order and calculates backward similarity on the basis of the feature information of the similarity calculation frame generated by the feature-information generating unit and the feature information of a predetermined number of the target frames temporally located before the similarity calculation frame; a forward-similarity calculating unit that sets each of the target frames as a similarity calculation frame in order and calculates forward similarity on the basis of the feature information of the similarity calculation frame generated by the feature-information generating unit and the feature information of a predetermined number of the target frames temporally located after the similarity calculation frame; and a scene switching point detector that detects the target frame forming a scene switching point on the basis of the backward similarity of each of the target frames calculated by the backward-similarity calculating unit and the forward similarity of each of the target frames calculated by the forward-similarity calculating unit.