An apparatus and method for controlling an auto-zooming operation of a mobile terminal. The apparatus and method for controlling an auto-zooming operation of a mobile terminal can automatically adjust the size of a target subject captured by an image capture device such as a camcorder to be equal to a predetermined size irrespective of a distance between the image capture device and the target object. The apparatus and method includes the steps of a) determining whether an auto-zooming function is selected during a moving image capture mode, and determining a size ratio of a main target object to be captured when the auto-zooming function is selected; b) determining the determined main target object size ratio to be a reference ratio, and capturing the main target object; and c) determining whether a main target object size ratio of video data captured during the moving image capture mode is equal to the reference ratio, and performing a zoom-in operation or a zoom-out operation when the main target object size ratio of the captured video data is different from the reference ratio to enable the main target object size ratio that was changed during the moving image capture mode to be equal to the reference ratio.