A target object detecting unit 13 that detects a target object existing within a predetermined distance from an HMD 200 from a moving image of a real world captured by a camera 202 installed in the HMD 200 displaying a virtual space image and an image superimposition unit 15 that causes an image of a predetermined range including the target object to be displayed superimposed on a virtual space image are provided, and when a user performs a predetermined work with a hand within a range photographed in the camera 202 installed in the HMD 200, the captured image of the predetermined range including the hand is displayed superimposed on the virtual space image, and thus the user can appropriately perform the predetermined work while looking at the captured image displayed superimposed on the virtual space image even while wearing the HMD 200.