A dual-view image display device includes a signal input module, a video processing module, a dual-view processing module and a display module, and the video processing module includes a nonlinear processing module. A dual-view image display method includes: inputting a video signal having a frame image that is split into two first images, processing the video signal to obtain the two first images, horizontally or vertically splitting each of the two first images into areas, nonlinearly enlarging each of the areas, and interpolating pixels to each of the enlarged areas to obtain two fullscreen second images. The nonlinear enlargement is used to allow the enlarged images generated during the dual-view image display to be robust to distortion, resulting in better image quality.