1. An ultrasonic imaging apparatus comprising: a display unit; and a controller configured to control the display unit to display: a first set of ultrasonic images comprising at least one first image of a plurality of images to be displayed in a first zone of a screen of the display unit, and a second set of ultrasonic images comprising at least one second image of the plurality of images to be displayed in a second zone of the screen of the display unit, wherein the first set of ultrasonic images corresponds to a first scanning of a target area which is performed by the ultrasonic imaging apparatus at a first time, and the second set of ultrasonic images corresponds to a second scanning of the target area which is performed by the ultrasonic imaging apparatus at a second time, wherein the plurality of images comprises a plurality of image frames classified into one or more image groups, wherein the first image comprises a first image frame, and the second image comprises a second image frame, wherein the first image frame and the second image frame are image frames belonging to different image groups.