A method of connecting a plurality of portable terminal over a wireless local area network (WLAN), the method including: a user selecting at least one contact from a contact list displayed on a screen of a first portable terminal, transmitting, from the first portable terminal to an external server over a cellular network, connection information necessary for establishing a WLAN link to the first portable terminal; pushing the connection information from the external server to a second portable terminal corresponding to the selected contact; a user pressing a connection authentication button on a selection menu displayed on the second portable terminal, and establishing the WLAN link to the first portable terminal from the second portable terminal by using the connection information.