To provide a retrieval device capable of retrieving a desired mail magazine more easily and perfectly.

The retrieval device for providing a retrieved result corresponding to a retrieval request from at least one user terminal receives a plurality of mail magazines registered beforehand and stores the plurality of mail magazines together with specific identification information indicating each of them, respectively. At least one mail magazine suited to the retrieval request is retrieved from the stored mail magazines, the priority order of each of at least one retrieved mail magazine is decided, and the specific identification information of the mail magazine is transmitted to the user terminal as a recommended mail magazine for instance according to the priority order.