The present invention provides a topic transition analysis system that determines a position on a primary media stream leading to a certain statement made in a language communication carried out in a secondary channel associated with the primary media stream. The topic transition analysis system includes a statement trigger string determination unit receiving a primary media stream and one or a plurality of language communication streams (hereinafter, language streams) executed in parallel with the media stream and determining whether or not a certain statement on the one or plurality of language streams has been made newly in response to contents of the media stream.