One aspect of the present invention discloses a license authentication method in a wireless access point (AP). The method comprises receiving a license authentication request including license information from a client; calculating a distance of the client from the wireless access point in response to the received license authentication request; based on the calculated distance, determining whether the client exists within a range of allowed positions for license authentication related to license location information for allowing authentication of a license included in the license information; and determining whether to authenticate in response to the license authentication request based on the determination result.