Ultrasonic diagnostic apparatus and operating method for the same

The present invention relates to an ultrasonic diagnostic apparatus and its operation method. Method of operation of the ultrasonic diagnostic apparatus according to an embodiment of the present invention for acquiring ultrasound data corresponding to the step of setting a region of interest (ROI) to be expanded in the ultrasound image of the target object, a candidate area including the area of ​​interest phase, based on the obtained ultrasound data, and generating a candidate image corresponding to the candidate regions, the method comprising: detecting a swing of the probe, and based on the shake of the detection probe, the candidate corresponding to the region of interest and a step of displaying a portion of the video image.