A display device includes a wireframe image determining unit for determining whether an image indicated by image data is a wireframe image, a filter characteristic setting unit for setting filter characteristics to suppress a high frequency component of the image when the image indicated by the image data is not a wireframe image, and setting the filter characteristics to suppress more the high frequency component compared to when the image is not the wireframe image when the image indicated by the image is the wireframe image, a filtering processor for reducing the image indicated by the image data while performing filter processing on the image based on the set filter characteristics to generate a filtered image, a display processor for generating a display image, inputting the filtered image, and arranging the filtered image on the display image, and a display unit for displaying the display image.