1. An interesting section identifying device for identifying an interesting section of a video file based on an audio signal included in the video file, the interesting section being a section in which a user is estimated to express interest, the interesting section identifying device comprising: an interesting section candidate extracting unit configured to extract an interesting section candidate from the video file, the interesting section candidate being a candidate for the interesting section; a detailed structure determining unit configured to determine whether the interesting section candidate includes a specific detailed structure; and an interesting section identifying unit configured to identify the interesting section by analyzing a specific section when the detailed structure determining unit determines that the interesting section candidate includes the detailed structure, the specific section including the detailed structure and being shorter than the interesting section candidate.