1. An image processing apparatus comprising: a detecting unit configured to detect 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 and size calculating unit configured to calculate a size and a position of the detected one of the entire person and the part of the person in the image; a graphical user interface (GUI) disposing unit configured to dispose 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; and a processing unit implemented by circuitry and configured to extract a first region that is a part of the image produced by the image data, in response to the calculated size being determined as being small, and to extract a second region that is an entirety of the image, including the region that is a part of the image, in response to the calculated size being determined as being large, enlarge, in response to the first region being extracted, the extracted first region that is a part of the image in accordance with a size of a screen which displays the image, and center, in response to the first region being extracted, the extracted first region that is a part of the image with respect to the screen, in response to the extracted first region being off-center from a center position of the screen, wherein the GUI disposing unit disposes the GUI elements on the image after the processing unit enlarges and centers the extracted first region that is a part of the image, without disposing GUI elements prior to the processing unit enlarging and centering the extracted first region that is a part of the image.