[Problem] To fulfill a customer' s desires as much as possible in a real estate transaction, and to increase the diversity of services of a real estate broker, thereby increasing competitiveness. [Solution] Provided is a real estate brokerage system for assisting in brokering activities in a real estate transaction, said real estate brokerage system comprising : a transaction condition setting unit 206 for setting a transaction condition for a piece of real estate being transacted; a deed data etc. generation unit 206a for generating deed data verifying that a person is a new occupant of the real estate on the basis of the transaction condition set by the transaction condition setting unit 206; a 205a linked to a guarantee system 6 for guaranteeing the legitimacy of the deed data generated by the deed data etc. generation unit 206a; and a transaction execution unit 606 for executing the transaction for the real estate on the basis of the verification obtained by the 205a. On the basis of a drawing operation carried out by a prospective occupant, the transaction condition setting unit 206 randomly determines a portion of a transaction condition that includes a discount rate or a brokerage fee related to the real estate being transacted, and then sets the determined transaction condition.