The invention discloses an image display method, including obtaining the update window information according to the layer information required to update when the image displays the update; reading in the layer image information according to the updated window information; storing the image information to the buffer storage after being processed; controlling the display device to display the image information of each layer stored in the buffer storage after being processed. The invention also discloses an image display device. The invention can reduce the power waste for reading the image meanwhile reduce the cost of the storage.