1. An imaging apparatus comprising: an imaging element configured to produce an imaging output; a detecting circuit configured to detect an object based on image data produced from the imaging output of the imaging element and to calculate a feature value representing a feature of the detected object; a memorizing circuit configured to memorize feature values of photographing objects; a comparing circuit configured to compare the feature value obtained by the detecting circuit with the feature value of at least one photographing object previously memorized by the memorizing circuit; and a display device configured to display an image based on the image data produced from the imaging output of the imaging element, wherein the comparing circuit uses a feature value calculated by the detecting circuit based on the image data used to display the image on the display device in the comparison between the feature value obtained by the detecting circuit and the feature values previously memorized by the memorizing circuit, and wherein the display device displays information relating to a comparison result provided by the comparing circuit.