the present invention is intended to link television broadcast content and web content with each other so that both types of content match the characteristics of television media , and prevent the viewing of television broadcasting from being interrupted . an associated information providing method for providing associated information linked with a video to an audience includes the steps of : receiving select information for selecting the video viewed by the audience and audience identification information for identifying the audience ; retrieving locational information on a network of associated information about contents of the video viewed by the audience on the basis of the received select information ; and transmitting the retrieved locational information to the audience on the basis of the audience identification information .