The present invention relates to a financial service providing method for the payment and management of a deposit between a landlord and a tenant. The method comprises the steps that a service providing server providing a financial service to a landlord and a tenant : (1) receives conditions according to the real estate rental contract between the landlord and the tenant and joins a financial product for paying and managing a deposit for the real estate rental contract; (2) accumulates payment for payment for the installment of the deposit received from the tenant; (3) receives management information from a management company which manages the accumulated financial product; (4) calculates benefits by using the received management information during a predetermined settlement period; and (5) pays the calculated benefit to the landlord.[Reference numerals] (S100) Installment finace product subscription processing step; (S200) Payment of tenant calculating step; (S300) Selection of operating strategy from leaseholder receiving step; (S400) Payment given from tenant accumulating step; (S500) Operating information from operating company receiving step; (S600) Profit calculating by using operating information step; (S700) Paying the calculated profit to leaseholder step; (S800) Paying original payment to tenant stepCOPYRIGHT KIPO 2014