The present invention relates to an online real estate agency operation system and a method thereof. More specifically, the system does not receive information to suppliers but only receives registration of real estate consumers online. The system includes a supplier terminal, an operation server computer, a consumer terminal, and an agent terminal connected through a communications network such as wired or wireless Internet. The real estate consumer information is registered in the system of the online real estate agency website provided by the computer. The system measures the reliability of the information to execute the real estate transaction by mediating the term and price negotiation between an offline supplier and an online consumer.(AA) Write desired rental conditions(BB) Recommend housing meeting the conditions(CC) Settle a contract after site visit(DD) Transfer the commission and outstanding paymentCOPYRIGHT KIPO 2016