Method and system for establishing wireless local area netwrok link between portable terminals

PURPOSE: A method for forming a wireless local area network (WLAN) link between portable terminals and a system for the same are provided to support a convenient and rapid wireless LAN connection when forming the WLAN link between the portable terminals and to strengthen security safety. CONSTITUTION: A first portable terminal transmits a connection request message including a first partial security key which is a part of a first security key to a second portable terminal through a cellular network (511). The first portable terminal outputs a sound including a second partial security key which is a part of the first security key (513). The first portable terminal receives a WLAN connection request including a second security key through a WLAN from the second portable terminal which receives the sound (515). The first portable terminal forms a WLAN link with the second portable terminal if the first security key and the second security key are identical (519). [Reference numerals] (501) Launch a connection application; (503) Source security key [first partial security key + second partial security key]; (505) Obtain contact information; (507) Display a contact list; (509) Select the contact information; (511) Transmit a connection request message [first partial security key]; (513) Output sound [second partial security key]; (515) Receive a wireless LAN connection request [copy security key]; (517) Verify a mobile device; (519) Form a wireless LAN link; (521) Perform a certain action; (AA) Start; (BB) End