A terminal device receives satellite signals from a plurality of satellite positioning system (SPS) satellites and locates a position. The terminal device periodically calculates a first drift df 1 of a local oscillator using a reference frequency Hr, calculates a search range of the satellite signal using the first drift df 1 , calculates a second drift df 2 of the local oscillator using a reception frequency of the satellite signal, calculates a reference frequency error beta which is an error of the reference frequency by calculating a difference between the first drift df 1 and the seconddrift df 2 , and calculates an error correction value betaav of the reference frequency by subjecting a plurality of the reference frequency errors beta to a statistical process.