Apparatus and method for determining position of mobile station

The present invention provides an apparatus and method for reducing the position error of the mobile station only signals directly estimating the radio propagation delay error over the propagation measurements to be used in a mobile communication system, and a mix of GPS signals or only or mobile communication system, do. Apparatus for estimating the location of the mobile terminal from the mobile communication system according to the present invention, the movement from the communication system receives the position acquisition signal for position acquisition of the mobile station, and outputs to obtain a position signal from the position acquisition signal and position signal obtaining unit that, the using the acquired position signal is the first position calculator for calculating a first position value and the propagation delay for setting the propagation delay margin of error by using the obtained position signal error range setting unit and, the established propagation delay margin of error with the with the first position value for use by the propagation delay error estimated propagation delay error estimating a value estimating the propagation delay error estimation value and the first position value by the second position value calculate to include the second position value and outputting a secondary position calculation as the estimated position of the mobile station. Position estimation, the error range set, TOA, TDOA, AOA, GPS, location of the mobile terminal.