PROBLEM TO BE SOLVED : To provide a beneficial real estate transaction.SOLUTION : A mediation device includes an information presentation part, a selection reception part, an information intermediation part, and a specific reception part. The information presentation part presents object information regarding real estate obtained from a seller. The selection reception part receives selection information regarding the real estate from a buyer. The information intermediation part intermediates mediation information regarding a transaction of the real estate shown by selection information between the seller and the buyer. From the buyer, the specific reception part receives specific information which specifies real estate from the real estate shown in the selection information.COPYRIGHT : (C)2016, JPO&INPIT