Patent ID: 7937217

Claim:
A mobile communication terminal apparatus comprising: a geomagnetic sensor for detecting earth-geomagnetism; a displaying means; and a control means for calculating a geographical bearing base on values detected by the geomagnetic sensor, and displaying the resultant bearing information on the display means, the control means correcting the bearing information, when the detected value of the geomagnetic sensor is in a predetermined abnormal status, and the abnormal status has continued over a predetermined time, during displaying the bearing information on the display means, displaying an information indicating that an accuracy of the bearing information is low, or an information indicating that the correction is in execution, on the display means, when the correction of the bearing information is in execution, and displaying an information indicating that the accuracy of the bearing information is returned, or an information indicating that the correction of the bearing information has completed, on the display means, after the correction of the bearing information has completed, wherein the geomagnetic sensor detects a plurality of earth-geomagnetism in a plurality of perpendicular directions each other, the control means performs a detection of an offset error of the geomagnetic sensor and correction of the same, as the above correction, if at least one of the detected values of plurality of earth-geomagnetism becomes the predetermined abnormal status and the predetermined abnormal status continues over a predetermined time, and the control means does not perform the detection of the offset error of the bearing sensor and the offset error correction processing, as the correction, if the predetermined time is not passed from when at least one of the detected values of the plurality of the earth-geomagnetism in the plurality of directions becomes the predetermined abnormal state to when all of the detected values of the earth geomagnetism in the plurality of directions is returned from the abnormal state.