1. An ultrasonic imaging apparatus comprising: an ultrasonic probe configured to transmit ultrasonic signals toward an object and to receive ultrasonic signals reflected by the object; a beamformer configured to perform beamforming based on the ultrasonic signals received by the ultrasonic probe; and an image processor configured to generate an ultrasonic image of an examined region within the object based on a result of the beamforming, to extract characteristic information which relates to the examined region from the generated ultrasonic image, and to judge whether or not the examined region coincides with a target region based on the extracted characteristic information.