PROBLEM TO BE SOLVED : To timely perform business activity of communication line marketing to a person who has concluded a real estate rental contract, and to quickly perform communication environment maintenance even to a conclusion target real estate property of the person who has concluded the contract.SOLUTION : A contract support device connected via a network 400 to tablet terminal equipment 100 allocated to a real estate agent store such that required information can be communicated comprises : a reception part 240 for receiving basic information as information indicating specification of a contract scheduled person of a real estate rental property and the necessity of communication environment maintenance of the real estate rental property and added information specifying a conclusion target property of the real estate rental property contract; an information storage part 280 for storing information; a search part 260 for, when new communication contract information is determined to be included, searching a line contract information registration part 270 in which a plurality of sets of line contract information is registered to acquire communication contract information corresponding to a new property name; and a distribution part 214 for distributing the basic information stored by the information storage part 280 to each tablet terminal equipment 100.SELECTED DRAWING : Figure 3COPYRIGHT : (C)2018, JPO&INPIT