1. An image-sound segment corresponding method comprising: an image segment classification step that analyzes an input video to generate a plurality of image segment groups, each of the image segment groups including a plurality of image segments which include an identical object; a sound segment classification step that analyzes the input video to generate a plurality of sound segment groups, each of the sound segment groups including a plurality of sound segments which include an identical object; an inter-segment group score calculation step that calculates a similarity score between each image segment group and each sound segment group, based on a time duration on which at least one of the image segment group and the sound segment group is present; and a segment group correspondence decision step that decides, using the scores, whether or not an object in the image segment groups and an object in the sound segment groups are the same.