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, the detailed structure being a structure in which features related to a frequency of the audio signal exhibit at least a predetermined amount of variation; 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; an Anchor Model storage unit configured to store Anchor Models expressing features of each of a plurality of sound types that serve as a reference; a designated time acquiring unit configured to acquire a designated time from the user; and a likelihood vector generating unit configured to calculate, for each of a plurality of first unit sections of the audio signal, a likelihood of a feature vector for each of the Anchor Models, the feature vector indicating features of the audio signal in the first unit section, and to generate a likelihood vector having the calculated likelihoods as components, wherein the interesting section candidate extracting unit extracts the interesting section candidate based on the likelihood vector so that the interesting section candidate includes the designated time and is longer than the first unit section, and the detailed structure determining unit determines whether the detailed structure is included in the specific section within a portion that includes the interesting section candidate, the specific section being longer than the first unit section and shorter than the interesting section candidate.