An image processing apparatus and an image processing method are provided. The image processing apparatus includes: a video processor which processes and displays an image; a receiver which receives a user's selection; and a controller which controls the video processor to display a plurality of password input screens each including a plurality of keys, display a key corresponding to the user's selection on a selected password input screen, and display a random key on at least one other password input screen from the plurality of password input screens which is different from the selected password input screen.