The present invention relates to a system for paying a monthly rental fee of a real estate which obtains real estate information, lessor information, lessee information, and monthly rental contract information in a storage unit from at least one customer terminal, and processes monthly rental fee payment between a lessor and a lessee by connecting to a financial institute server at a monthly rental fee payment date by using the real estate information, the lessor information, the lessee information, and the monthly rental contract information. According to the present invention, the convenience between the lessor and the lessee can be promoted during the monthly rental fee payment process, can support tax administration of a taxation authority, and can realize tax justice of monthly rental income of the lessee and monthly rental expense of the lessor through transparent monthly rental payment, reception, and income.(111) Communication interface(112) Storage unit(113) Control unit(113a) Information registration processing unit(113b) Monthly rental fee payment processing unit(120) National tax service server(130) Financial institute server(140) Local government server(150) Customer terminal(160) Register office serverCOPYRIGHT KIPO 2018