The present invention provides the steps of maintaining a first database containing profiles of a plurality of users in a network; maintaining a second database containing relationship index between some of the users wherein the relationship index is determined based upon degree of correspondence relationship between the users; forming a social network comprising a plurality of nodes and a plurality of links between at least some of the nodes, in association with the relationship index stored in the second database; upon receipt of a request from a first user, searching for at least one route connecting the first user to a second user in the social network based, at least in part, upon said existing links and the relationship index of the links; and evaluating each of the searched routes based, at least in part, upon the relationship indexes of the links which form said respective searched routes.