5. The interesting section identifying device of claim 4 , wherein the detailed structure determining unit determines whether the detailed structure is included in an initial second unit section or a final second unit section of the interesting section candidate, and the interesting section identifying unit identifies a starting point of the interesting section by analyzing the initial second unit section when the detailed structure is determined to be included in the initial second unit section, and identifies an ending point of the interesting section by analyzing the final second unit section when the detailed structure is determined to be included in the final second unit section.
5. The interesting section identifying device of claim 4 , wherein the detailed structure determining unit determines whether the detailed structure is included in an initial second unit section or a final second unit section of the interesting section candidate, and the interesting section identifying unit identifies a starting point of the interesting section by analyzing the initial second unit section when the detailed structure is determined to be included in the initial second unit section, and identifies an ending point of the interesting section by analyzing the final second unit section when the detailed structure is determined to be included in the final second unit section. 8. The interesting section identifying device of claim 5 , wherein when a second unit section determined to include the detailed structure is included in the interesting section candidate, a portion of the interesting section candidate excluding the second unit section is designated as a second temporary interesting section candidate, and when the second unit section determined to include the detailed structure is not included in the interesting section candidate, the interesting section candidate is designated as the second temporary interesting section candidate, and in a second unit section determined to include the detailed structure, the interesting section identifying unit repeats a process, for successive third unit sections starting from a third unit section closest to the reference section, of (i) determining whether the Euclidean distance from the reference vector to the third unit section frequency vector of the third unit section exceeds the threshold Euclidean distance and (ii) including the third unit section in the second temporary interesting section candidate when determining that the Euclidean distance does not exceed the threshold Euclidean distance, the interesting section identifying unit terminating repetition of the process and designating a starting point or an ending point of the second temporary interesting section candidate as a starting point or an ending point of the interesting section candidate upon determining that the Euclidean distance exceeds the threshold Euclidean distance.