Abstract: A mobile apparatus according to the disclosure includes: a sensor unit to calculate a moving distance and a moving direction; a positioning unit to calculate a first current position by using positioning information for positioning provided in a calibration area that is among areas in which the positioning information is provided, the calibration area being the area in which first reliability representing accuracy of the positioning information is equal to or higher than a first threshold; a current position calculation unit to estimate a second current position by using the moving distance and the moving direction calculated by the sensor unit; and a calibration unit to calibrate a parameter to be used to estimate the second current position in the current position calculation unit, by using the first current position.