| 摘要 |
Disclosed is a passage extraction apparatus and so forth whereby a Web or a document database is searched, and a direct mediatory summary whereby a passage briefly explaining a situation wherein a focus sentence determined to be true or false is established along with a situation wherein an opposing sentence for an opposition is established is extracted. In particular, the relevance and impartiality with the focus sentence and the density of characteristic language is considered. A document is searched for with a focus statement as a condition; in addition a document is searched for with an opposing statement as a condition; a pure focus search document collection relating only to the focus statement and a pure opposing search document collection relating only to the opposing statement are classified (S103); a word score is calculated (S104, S105) from the frequency of pure focus search documents and from the frequency of pure opposing search documents; in addition the characteristic language of the affirmative argument and the characteristic language of the negative argument are determined (S2801); and a sentence score is obtained from the characteristic language (S3501) and a passage score is calculated (S107). |
