KEYWORD TYPE DETERMINATION DEVICE, METHOD, AND PROGRAM

PROBLEM TO BE SOLVED: To determine an appropriate keyword type by correcting keyword relevance scores of individual keywords in accordance with keyword relevance scores of similar keywords.SOLUTION: An initial value of keyword relevance scores indicative of relevance to a keyword type is set to an input keyword, and category relevance scores indicative of relevance of a category of the keyword to respective keyword types are calculated from a database on the basis of keyword relevance scores of keywords belonging to the category, and keyword relevance scores indicative of relevance to respective keyword types are calculated on the basis of category relevance scores of the category to which the keyword belongs, to acquire the keyword relevance scores, and keyword relevance scores obtained by correcting the keyword relevance scores so as to allow comparison among the keyword relevance scores of respective keyword types are compared to determine a keyword type.