1. A method for automatically changing information originating from at least one of a first user and a second user by using a communication device, the method comprising steps of: (a) a first communication device of the first user searching for at least one second communication device of at least one second user as a target with which to perform a specific interaction within a predetermined distance therefrom or searching for at least one second communication device connected to an access point (AP), an ad-hoc network, or a base station of a cellular network to which the first communication device is connected; (a0) selecting at least one specific second communication device from among the searched at least one second communication device to change the user-originating information; (b) the first communication device transmitting to, or receiving from, the specific second communication device data related to a specific interaction, if a specified touch gesture is detected in the first communication device; and (c) at least one of the first and the second communication devices allowing a server to update the information originating from at least one of the first user and the second user stored in the server or a storage device interacted with the server by referring to the transmitted data related to the specific interaction, wherein the first communication device searches for the at least one second communication device based on whether the at least one second communication device has a certain application program that is related to the specific interaction, and wherein the first communication device selects the specific second communication device where the certain application is turned on in either the background or the foreground, if there are multiple second communication devices searched.