A transmission-type head-mounted display device includes an image display, a control section configured to control the image display section, a position detecting section, a visual-field detecting section configured to detect a visual field of the user, and a wireless communication section configured to perform wireless communication with an external apparatus. The control section includes a state-information acquiring section configured to acquire, via the wireless communication section, state information including a position of an own aircraft, which is a mobile body set as an operation target object of the user, and a support-information creating section configured to create, on the basis of a relation between the position and the visual field of the user and the position of the own aircraft, a support image including support information for operation of the own aircraft and cause the image display section to display the support image as the virtual image.