1. An image processing device comprising: a display having a display screen on which a plurality of images can be displayed; and a controller configured to perform: selecting a plurality of selected images from the plurality of images while the plurality of images are displayed on the display screen; selecting a selected template from a plurality of templates, each of the plurality of templates defining display states of the plurality of selected images, the display states including at least one of: positions where the plurality of selected images are to be displayed on the display screen; and shapes which the plurality of selected images are to be displayed on the display screen; controlling the display to display a first combined image on the display screen, the first combined image being generated by combining the plurality of selected images and the selected template, the plurality of selected images in the first combined image being displayed on a basis of the display states of the plurality of the selected images defined by the selected template; selecting a first type of processing from a plurality of types of processing and at least one selected image from the plurality of selected images while the first combined image is displayed on the display screen; and controlling the display to display a second combined image on the display screen, the second combined image being generated by applying the first type of processing to the at least one selected image included in the first combined image.