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 storage circuit configured to store 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 stored by the storage 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 device, in the comparison between the feature value obtained by the detecting circuit and the feature values previously stored by the storage circuit, wherein the comparing circuit is configured to determine whether the feature value calculated by the detecting circuit and the feature value of the photographing object previously stored in the storage circuit correspond to the same photographing object, and wherein the display device displays information relating to the photographing object when a comparison result provided by the comparing circuit indicates that the calculated feature value and the previously stored feature value correspond to a same photographing object.