A display apparatus, comprising: a first image acquisition device, configured to acquire a target image of a target region if a human body (Hu) is in the target region; an image processing device, configured to identify a body physical feature of the human body (Hu) according to a human body image in the target image; an image generating device, configured to generate, according to the body physical feature, a virtual human body image corresponding to the human body (Hu) and conforming to a target age; and a display device, configured to display the virtual human body image, a region displaying the virtual human body image being a virtual human body display region, characterized in that: the first image acquisition device is further configured to acquire a background image of the target region if no human body is in the target region; the image processing device is further configured to identify, according to the target image, a region occupied by the human body image in the target image; the region occupied by the human body image corresponds to a human body corresponding region of the display device; and the virtual human body display region is located in the human body corresponding region; the display device is a mirror display device, the display device is configured to display a portion of the background image corresponding to a filled display region in the filled display region, the filled display region is a display region within the human body corresponding region and outside the virtual human body display region, and a mirror display is implemented outside the human body corresponding region; and the display apparatus further comprises a storage device, the storage device is configured to store the background image. a first image acquisition device, configured to acquire a target image of a target region if a human body (Hu) is in the target region; an image processing device, configured to identify a body physical feature of the human body (Hu) according to a human body image in the target image; an image generating device, configured to generate, according to the body physical feature, a virtual human body image corresponding to the human body (Hu) and conforming to a target age; and a display device, configured to display the virtual human body image, a region displaying the virtual human body image being a virtual human body display region, characterized in that: the first image acquisition device is further configured to acquire a background image of the target region if no human body is in the target region; the image processing device is further configured to identify, according to the target image, a region occupied by the human body image in the target image; the region occupied by the human body image corresponds to a human body corresponding region of the display device; and the virtual human body display region is located in the human body corresponding region; the display device is a mirror display device, the display device is configured to display a portion of the background image corresponding to a filled display region in the filled display region, the filled display region is a display region within the human body corresponding region and outside the virtual human body display region, and a mirror display is implemented outside the human body corresponding region; and the display apparatus further comprises a storage device, the storage device is configured to store the background image. the first image acquisition device is further configured to acquire a background image of the target region if no human body is in the target region; the image processing device is further configured to identify, according to the target image, a region occupied by the human body image in the target image; the region occupied by the human body image corresponds to a human body corresponding region of the display device; and the virtual human body display region is located in the human body corresponding region; the display device is a mirror display device, the display device is configured to display a portion of the background image corresponding to a filled display region in the filled display region, the filled display region is a display region within the human body corresponding region and outside the virtual human body display region, and a mirror display is implemented outside the human body corresponding region; and the display apparatus further comprises a storage device, the storage device is configured to store the background image.