Regarding a solution to a specific problem, an answer information registration unit 101 that stores answer information collected from a plurality of users in the database 100, and reaction information input by the user with respect to the answer information on the community site The action has changed from among the reaction information registration unit 105 to be stored in the database 100 in association with the responded response information, the action information acquisition unit 106 to acquire action information indicating the action of the user of the community site, and the user of the community site A user identification unit 107 that identifies a user and an answer information extraction unit 108 that extracts response information that the identified user has reacted to extract answer information that may have influenced the user's behavior. It can be used as information on effective solutions for
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