An image-displaying device includes a storing unit and a displaying unit. The storing unit stores first correlation data and second correlation data. The first correlation data indicates a plurality of first thumbnails including a plurality of first display thumbnails and also indicates a sequence of the plurality of first thumbnails. The second correlation data indicates a plurality of second thumbnails including a plurality of second display thumbnails and also indicates a sequence of the plurality of second thumbnails. The storing unit updates the second correlation data in response to an update instruction for adding one of the plurality of first thumbnails to the plurality of second thumbnails. The displaying unit includes a first display configured to display a plurality of first display thumbnails based on the first correlation data, and a second display configured to display a plurality of second display thumbnails based on the second correlation data. The second display displays a plurality of second display thumbnails based on the updated second correlation data if the second correlation data is updated.