| 摘要 |
PROBLEM TO BE SOLVED: To enhance an appealing effect of a content.SOLUTION: An extraction device includes a calculation unit and extraction unit. The calculation unit calculates an index value indicating relevance between a retrieval query transmitted from a user terminal and a re-retrieval query that is another retrieval query which is further transmitted from the user terminal after the retrieval query has been transmitted. On the basis of the index value calculated by the calculation unit, the extraction unit extracts a keyword which is associated with a predetermined content extracted on the basis of the retrieval query, from the re-retrieval query; or extracts a keyword which is associated with a predetermined content extracted on the basis of the re-retrieval query, from the retrieval query.SELECTED DRAWING: Figure 2 |
