1. A method for applying a trimming operation to an image content, comprising the steps of: (a) detecting a person and an object in the image content by using a face detection technology and an object detection technology; (b) calculating an area of a face region of the detected person and an area of a region of the detected object, and calculating a distance between a central point of the face region of the detected person and a central point of the image content, and a distance between a central point of the detected object and the central point of the image content; and (c) applying the trimming operation to the object if the area of the region of the detected, object is determined to be larger than that of the face region of the detected person by over a first prefixed percent, and applying the trimming operation to the object if the distance between the central point of the detected object and that of the image content is determined to be a second prefixed value or less and the distance between the central point of the face of the detected person and that of the image content is determined to be larger than the distance between the central point of the detected object and the central point of the image content by over a third prefixed value.