1. An image processing apparatus comprising: a detecting unit detecting one of an entire person and a part of a person in an image produced by image data acquired by image pickup by an imaging unit; a position/size calculating unit calculating a size and a position of the detected one of the entire person and the part of the person in the image; and a GUI disposing unit disposing graphical user interface (GUI) elements, which are to be displayed by being superimposed on the image produced by the image data, on the image based on the calculated size and position.