According to an embodiment of the present invention, a method in which a rent manager server provides a real property transaction service to a landlord and a tenant, comprises the following steps : (a) receiving, from a landlord′ s terminal, a lease contract request including a landlord′ s first desired lease deposit amount, a first desired monthly rent amount, and information of a real property desired to be leased, and determining a reference lease price of the real property to be leased; (b) determining a first initial lease deposit amount and a first initial monthly rent amount within a range equal to the reference lease price by referring to the first desired lease deposit amount and the first desired monthly rent amount, and closing a lease contract including details stated earlier as terms of the contract; (c) receiving, from a tenant′ s terminal, a renting contract request including a tenant′ s second desired renting deposit amount and a tenant′ s second desired monthly rent amount, and information of a real property to be rented; and (d) determining a second initial renting deposit amount and a second initial monthly rent amount within a range equal to the reference lease price by referring to the second desired renting deposit amount and the second desired monthly rent and closing a renting contract including details stated earlier as terms of the contract.(100) Tenant terminal(200) Landlord terminal(300) Rent manager server(400) Bank server(S301) Access a real estate transaction service webpage(S302) Transmit a lease contract request(S303) Determine a reference lease price of a real property to be leased(S304) Determine an initial lease deposit amount and an initial monthly lease amount(S305) Process completion of the lease contract(S306) Transmit request for payment for the initial lease deposit amount and the initial monthly lease amount(S307) Access the real estate transaction service webpage(S308) Transmit request for the lease contract(S309) Confirm the initial rent deposit and the initial lease monthly rent amount(S310) Process completion of the rent contract(S311) Transmit request for payment for the initial rent deposit amount and the initial monthly rent amountCOPYRIGHT KIPO 2017