The invention provides a method for positioning a user equipment. First, a plurality of wireless links between the user equipment and a plurality of mobile networks are established. A plurality of first location information sets describing a location of the user equipment are then obtained from the mobile networks through the wireless links. The first location information sets are then converted to a plurality of second location information sets with a predetermined format. The second location information sets are then combined to estimate a third location information set describing the location of the user equipment.