A method and system for managing search mediation information, which can selectively count a number of inputs of the search mediation information using a class-C Internet Protocol (IP) address, and create an input rank list or a popularity list associated with the search mediation information by referring to the counted number of inputs is provided. According to the present invention, there is provided a method and system for managing search mediation information, which can identify terminals, by a network unit, abusively inputting the same keyword with malicious intent.