A display device and an image display system are provided which can easily identify different kinds of windows. Solution: A list X of simplified images M is based on data containing associated information of multiple attributes as metadata. A display is provided to display the list X in a matrix in which the simplified images M are located for respective pieces of associated information of one attribute in a row direction while the simplified images M are located for respective pieces of associated information of another attribute in a column direction. The display has a first sub window SW1 and a second sub window SW2 that are displayed in different display modes on the list X, the first sub window SW1 containing the images M sharing the associated information of one attribute and the associated information of another attribute in the list X of the images M, the second sub window SW2 containing the images M placed in the same folder in the list X of the images M.