Disclosed are a location service providing system and a method for providing a triggered location request service. An H-SLP sets a priority order of a plurality of positioning methods which a target terminal supports according to a set priority order set condition and transmits priority order information according to respective positioning methods to the target terminal. Further, the target terminal may receive information about the positioning methods including the priority order and select a positioning method having the highest priority order among the positioning methods, which can be used in its current electric wave environment. Moreover, the H-SLP and the target terminal may calculate a location of the target terminal according to a positioning method that the target terminal has selected. Accordingly, although it is difficult to calculate the location of the target terminal according to the positioning method that the target terminal has selected, a location service of the target terminal can be continuously provided.