1. An apparatus for selectively outputting image frames, comprising: a main topic frame extractor which extracts a main topic frame, which expresses a main topic selected by a user, from continuous image frames; a composite image frame creator which extracts a key object to realize the main topic from the main topic frame, and extracts a background object with respect to the key object from a peripheral frame sequentially adjacent to the main topic frame to create a composite image frame using the key object and the background object; a wide-angle image frame creator which creates a wide-angle image frame, which comprises the composite image frame and an image frame having common information with the composite image frame, among the continuous image frames; an attractive region setting unit which sets an attractive region with respect to the wide-angle image frame; and an output unit which outputs the attractive region, wherein in order to extract the main topic frame, a threshold value is set by using a cost function set in a unit block having a set size, and then an area or a color of the object expressed in the image frame can be estimated while increasing a size of a window by using an image masking method.