Abstract: A GPS positioning method is disclosed which can shorten the time required until positioning arithmetic operation is started after power is made available. An oscillation frequency of a reference frequency oscillator used in a GPS receiver section or a frequency variation of the oscillation frequency is measured using high precision frequency information provided by a standard wave. A result of the measurement is utilized to catch a signal from a GPS satellite. Further, a synchronization timing of a spread code of the spread spectrum signal from the satellite is detected to detect a small time component for time synchronization. After synchronization of the spread code is completed, a time of the boundary of one period of the spread code is detected from time information provided by a standard wave, and a time component greater than the small time component for time synchronization is detected based on the time of the boundary.