Abstract: An image processing apparatus and input control method thereof, are disclosed. The image processing apparatus includes: a display panel which displays an image; an image processing unit which processes the image to display in the display panel; a user input unit which receives a key selection from a user; and a control unit which generates a control signal to perform a first function based on an input key if a single key of a plurality of keys is input, and to perform a second function based on a mixture of an input key if at least two keys of the plurality of keys are input within a predetermined time. With this, depending on a position of keys and an input order, the number of keys necessary to perform various functions is reduced, providing a user with an intuitional user interface.