| 摘要 |
A keyword assignment device includes a class determination section that determines a corresponding class when a plurality of keywords are classified into a plurality of classes that are distributed in first to Nth hierarchies, a classification frequency calculation section that calculates a classification frequency of each class, a reference target hierarchy determination section that determines a reference target hierarchy, and a keyword determination section that determines the keyword of the corresponding class in the final reference target hierarchy to be a display keyword. The reference target hierarchy determination section determines a kth hierarchy to be the next reference target hierarchy when it has been determined that it is necessary to refer to the kth hierarchy that is higher than a jth hierarchy based on the classification frequency of the corresponding class in the jth hierarchy.
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