A differing region detection system, comprising: a difference information generating unit configured to generate inter-image difference information indicating a difference in feature amounts for each subregion between a first image and a second image that has been judged to have identity with the first image based on a first feature amount vector that is a set of feature amounts respectively corresponding to a plurality of subregions in the first image and a second feature amount vector that is a set of feature amounts respectively corresponding to a plurality of subregions in the second image, wherein the judgment of identity between frame images is performed by comparing the number of dimensions with identical feature amounts or the number of dimensions with non-identical feature amounts between two feature amount vectors or comparing sizes of the two feature amount vectors, wherein the first image is a first frame image constituting a first video and the second image is a second frame image constituting a second video and corresponding to the first frame image; a differing region detecting unit configured to detect a differing region that is an image region that differs between the first and second images, based on differences in the respective subregions indicated by the inter-image difference information, and output detection information indicating a result of the detection, wherein the differing region detecting unit is configured to include information indicating a segment in which the differing region has been detected between the first and second videos in the detection information and output the information; and a detection result output unit configured to identifiably display a position of the differing region between the first and second images based on the detection information and the segment in which the differing region has been detected based on the detection information, wherein in response to a user input for selecting a segment in which the differing region has been detected, the detection result output unit is configured to display the first and second videos in that segment. a difference information generating unit configured to generate inter-image difference information indicating a difference in feature amounts for each subregion between a first image and a second image that has been judged to have identity with the first image based on a first feature amount vector that is a set of feature amounts respectively corresponding to a plurality of subregions in the first image and a second feature amount vector that is a set of feature amounts respectively corresponding to a plurality of subregions in the second image, wherein the judgment of identity between frame images is performed by comparing the number of dimensions with identical feature amounts or the number of dimensions with non-identical feature amounts between two feature amount vectors or comparing sizes of the two feature amount vectors, wherein the first image is a first frame image constituting a first video and the second image is a second frame image constituting a second video and corresponding to the first frame image; a differing region detecting unit configured to detect a differing region that is an image region that differs between the first and second images, based on differences in the respective subregions indicated by the inter-image difference information, and output detection information indicating a result of the detection, wherein the differing region detecting unit is configured to include information indicating a segment in which the differing region has been detected between the first and second videos in the detection information and output the information; and a detection result output unit configured to identifiably display a position of the differing region between the first and second images based on the detection information and the segment in which the differing region has been detected based on the detection information, wherein in response to a user input for selecting a segment in which the differing region has been detected, the detection result output unit is configured to display the first and second videos in that segment.