| 摘要 |
<p>Provided is an information extraction system capable of precisely and comprehensively extracting positive expressions and negative expressions. An opinion/emotion word detection means (12) browses an opinion/emotion dictionary (21), finds matches, detects opinion/emotion words in an obtained character string, and applies absolute polarity thereto. A term polarity determination means (13) detects terms on the basis of co-occurrence with opinion/emotion words, and determines the polarity of the terms on the basis of the absolute polarity of the opinion/emotion words. A determination range expansion means (14) expands word strings comprising words connected to terms, and determines the polarity of a word string for determination. A series of individual determinations are repeated, and a determination tallying means (15) tallies the individual determination results for each word string for determination. A consolidated polarity determination unit (16) calculates a ratio (N) on the basis of the number of positive determinations and the number of negative determinations, and makes a consolidated determination. An expression extraction means (17) extracts the consolidated determination result and outputs same to an expression word string dictionary (22).</p> |
