An ultrasonic imaging apparatus is disclosed, which comprises an ultrasonic probe (200), a plurality of position sensors (210, 220) mounted to the ultrasonic probe, and a control unit, wherein the control unit is configured to determine whether a position sensor is separated from the ultrasonic probe. The control unit determines whether at least one of a distance and a direction between the plurality of position sensors corresponds to at least one of a predetermined distance and a predetermined direction on the basis of coordinate information of the plural position sensors, and determines that at least one of the plural position sensors is separated from the ultrasonic probe when at least one of the distance and the direction does not correspond to at least one of the predetermined distance and the predetermined direction.
