Positioning system, information supply device, terminal device, control method of information supply device, control program of information supply device, and computer readable recording medium recording control program of information supply device

An information supply method implemented by an information supply device, the method comprising:

• receiving a position of each of a plurality of terminals via a first base station, the position of each of the plurality of terminals being measured respectively by each of the plurality of terminals;
• receiving total delay information via the first base station, the total delay information being calculated by each of the plurality of terminals by measuring a timing difference between a standard timing signal that is corrected in time based on a satellite signal and a base station timing signal received from the first base station;
• receiving information about a receiving condition of the satellite signal measured by each of the plurality of terminals via the first base station;
• selecting one terminal from the plurality of terminals based on the receiving condition of the satellite signals;
• calculating a propagation delay time between the one terminal and the first base station based on the position of the one terminal received from the one terminal and a position of the first base station;
• calculating a device peculiar delay time based on the total delay information received from the one terminal and the propagation delay time, the device peculiar delay time occurring inside the first base station and the one terminal during communication between the first base station and the one terminal;
• and
• supplying the device peculiar delay time.