1. A target-image search apparatus comprising: a first target region detecting device for detecting a plurality of face regions from a first subject image among a plurality of frames of subject images obtained by sensing the image of a subject successively, wherein each of the face regions include a face; a coordinate detecting device for detecting a minimum value and a maximum value of each of X-coordinate positions and Y-coordinate positions of the plurality of face regions detected by said first target region detecting device; and a second target region detecting device for detecting the face regions in a first area, decided based upon the minimum values and maximum values detected by said coordinate detecting device, in a second subject image different from the first subject image among the plurality of frames of subject images, wherein the first area is larger than a second area that encloses the detected plurality of face regions and the first area is smaller than the second subject image.