The present invention relates to a system and method for connecting wireless internet using number-base domain, the method according to the present invention may comprise the steps of (a) receiving an internet connection request signal from the mobile telephone; (b) determining if the received internet connection request signal is a number domain connection request signal and determining if the number domain exists in pre-stored number structure; (c) converting the number domain into a letter domain if the number domain exists in the pre-stored number structure; (d) transmitting web site information corresponding to the converted number domain to the mobile terminal. According to present invention, the domain input process can be simpler as the user has only to input number domain corresponding to homepage to be connected and press execution button.