1. A method for setting a relationship between users of a plurality of mobile terminals, the method comprising: receiving, at an information receiver module in a server of a mobile application installed on each of the plurality of mobile terminals, from the plurality of mobile terminals, information on gestures made on, and recognized at, the plurality of mobile terminals, respectively, with respect to a single user gesture, wherein the mobile application relates to a social network service, and further wherein the receiving of the information on the recognized gestures further comprises receiving information on directions of the plurality of mobile terminals relative to each other including whether the plurality of mobile terminals are oriented in the same direction or oriented in a different direction by a predetermined angular amount; determining, at a correlation determiner module in the server of the mobile application, a gesture correlation between the recognized gestures and the single user gesture based on the information on the recognized gestures, wherein the determining of the gesture correlation comprises further referring to information on the directions of the plurality of mobile terminals received during the receiving step; and setting, at a relationship setter module in the server of the mobile application, a relationship within the social network service between users of the plurality of mobile terminals based on the gesture correlation, wherein the information on the recognized gesture includes information on geographical locations of the plurality of mobile terminals, wherein the information on the directions of the plurality of mobile terminals is obtained from a sensor included in each of the mobile terminals; wherein the single user gesture comprises a gesture across at least two terminals, wherein the method further comprises: determining a location correlation of the plurality of mobile terminals based on the information on the geographical locations of the plurality of mobile terminals, wherein the location correlation is based on whether a distance between the geographical locations is within a predetermined distance range, and setting the relationship between the users of the plurality of mobile terminals by further referring to the location correlation.