A display device is provided. The device includes memories, a display unit, and a data collecting memory. The memories store a plurality of kinds of image data generated based on information acquired from different kinds of sensors, respectively. The display unit displays the image data that is selected by a user among the plurality of kinds of image data. The data collecting memory stores, in response to a predetermined report instruction, at least data of an image displayed on the display unit at the timing of the report instruction and, among the image data stored in the memories at the timing of the report instruction, the image data that is not displayed on the display unit.