Abstract: A retrieval device and retrieval service are provided for reserved retrieval of document information, so that, when there are duplicates in retrieval conditions registered by a plurality of users, these duplicates are eliminated from the retrieval conditions to thereby execute efficient retrieval. Copies of information regarding the retrieval result are made correspondingly to the number of the duplicates among the users and the copied information is expanded respectively in accordance with the registered retrieval conditions desired by the users. The expanded information is edited in a form desired by the user, and the edited result is delivered to a delivery destination such as an e-mail address registered by the user.