DISSATISFACTION EXTRACTION DEVICE, DISSATISFACTION EXTRACTION METHOD, AND DISSATISFACTION EXTRACTION PROGRAM

摘要

An objective of the present invention is to extract from a document which is written by a user of a product to be evaluated a dissatisfaction which is useful in improving the product to be evaluated. A dissatisfaction text candidate extraction unit (104) refers to an evaluation expression dictionary (108), and extracts, from a set of texts which is stored in a text set acquisition unit (101), a dissatisfaction text candidate including an evaluation object and an evaluation expression relating to the evaluation object and a comparison object and an evaluation expression relating to the comparison object. A polarity assessment unit (105) assesses the degree of polarity of the evaluation expression relating to the evaluation object and the evaluation expression relating to the comparison object. If the evaluation expression relating to the comparison object is an affirmative evaluation expression or a neutral evaluation expression, a dissatisfaction text extraction unit (106) assesses that a text wherein the difference (Pc-Pt) between a polarity value (Pt) of the evaluation expression relating to the evaluation object and a polarity value (Pc) of the evaluation expression relating to the comparison object is greater than or equal to a threshold value is a dissatisfaction text.