The embodiments of the invention disclose a display device and a terminal. The method includes the following steps: obtaining a first image when the terminal is connected, wherein the first image is an image including contents of a terminal display screen and current environment, the contents of the terminal display screen being contents displayed by the terminal in an anti-peeping mode; receivinga second image sent by the terminal, wherein the second image is real contents hidden by the terminal display screen at present; identifying a display area in the first image, wherein the display area is a screen display area of the terminal in the first image; and preprocessing the second image, integrating the preprocessed second image into the display area, generating a final display image, completing an image synthesis process, and displaying the final display image. Therefore, the display contents of the terminal screen can be prevented from being peeped at, and the security of screen display is improved.