The present invention relates to a method for determining an ionosphere delay scale factor for a real-time low orbit satellite. The method for determining an ionosphere delay scale factor for a low orbit satellite comprises the steps of: (a) extracting Galileo ionosphere parameters from a Galileo navigation message received from a Galileo receiver; (b) in consideration of the extracted Galileo ionosphere parameters, calculating the amount of delay of a ground ionosphere which is the amount of delay of the ionosphere at a ground altitude, and the amount of delay of the low orbit satellite ionospheric which is the amount of delay of the ionospheric at a low orbit satellite altitude; and (c) determining an ionosphere delay scale factor of the low orbiting satellite using the amount of delay of the ground ionosphere and the amount of delay in the low orbit satellite.
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