a focusing image display device is equipped with an autofocus processor , a spatial frequency detector , a magnification determiner and a focusing image display processor . the autofocus processor performs an autofocus operation using an image within a partial area of an effective pixel area . the spatial frequency detector calculates a spatial frequency of a focusing image within the partial area after the autofocus operation is completed . the magnification determiner determines the magnification of the focusing image in accordance to the spatial frequency . the focusing image display processor modifies the resolution of the focusing image with respect to the magnification .