Patent ID: 7116992

Claim:
A mobile station capable of calculating a current position by position calculation using radio wave, said mobile station comprising: a signal receiver for receiving radio wave; a position calculator for calculating the current position from a result of reception provided by the signal receiver; means for target position input for inputting a position constituting a target; a target position holder for holding the target position inputted from the means for target position input; a position comparator for comparing the current position of the mobile station calculated by the position calculator with the target position held at the target position holder; a position calculation controller for controlling a frequency of position calculation by the position calculator in accordance with a result of the position comparison by the position comparator; an application operated to a user based on the result of the position comparison by the position comparator; and an application controller for controlling operation of the application by using the result of the position comparison by the position comparator; wherein the position calculation controller uses a history of the result of the position comparison by the position comparator and executes the control of increasing the frequency of the position calculation by the position calculator when the mobile station approaches the target position at a high speed and executes the control of reducing the frequency of the position calculation by the position calculator when the mobile station approaches the target position at a low speed.