1. A head-mount type display device comprising: a display configured to display virtual imagery, and at least one of: capable of transmitting an external sight through the display, and capable of transmitting the external sight via video transmission; and at least one processor or circuit configured to: control a camera to acquire images, and while the camera is acquiring images: detect, by image processing, whether or not the acquired images include image data that is the same as image data of an operation object stored in a memory; and when the acquired images include image data that is the same as the image data of the stored operation object: determine whether the operation object is located within a predetermined distance range from the display, and if the operation object is located within the predetermined distance range: control the display to display a virtual image associated with the operation object; detect, by image processing, a gesture associated with the operation object; and when the gesture associated with the operation object has been detected, control the display to display a predetermined image associated with the operation object.