The present invention refers to network online joint realty arrangement business based on management system and method is provided to, for online joint realty arrangement business is dealer input member information, homepage establishment for visitor and intermediation information, real estate basic information without last two numbers inputted from the correlation-between-terminal for screen realty a/selling a generated data homepage information and request database the stored, basic information without last two numbers that is produced, based on a home page associated with the device a member, who has registered for member after generating the intermediating group by co-without last two numbers, and classification group intermediating area, for connection to the homepage performing logging in an data log dealer the trench using the short-time key and server after performing a authenticating member, through his/her web site is without last two numbers unit to input the real estate intermediation information and said visitor terminal 2006 selling/number of real estate inputted from information according to dealer business and intermediating cavity estate is performed online community intermediating performs to the task management.