1. A transmission type head mounted display device comprising: a first camera that images an outside scene; a second camera that images a user's eyes; a display that is capable of transmitting the outside scene; and a processor programmed to: receive an image captured by the second camera, the captured image including the user's eyes; determine, based on the captured image, a gazing point of a user; determine a distance from the user to the gazing point of the user based on a focal length of the user and an estimated field of view of the user as a field of view of the user who wears the transmission type head mounted display device; and adjust a position of the camera, based on the determined distance, so as to set an imaging range of the camera.