1. An apparatus for providing a dynamic user interface, the apparatus comprising: a touch screen configured to display graphical objects; an acquirer configured to acquire touch information about a user touching a touch screen, wherein the touch information comprises a first touch information and a second touch information; a first estimator configured to estimate an optimum touch region of the touch screen in consideration of physical characteristics of the user based on the touch information, wherein the first estimator is configured to calculate a first touchability level for each region of the touch screen based on the first touch information, wherein the first touch information comprises at least one of touch count information, and touch frequency information for each region of the touch screen, calculate a second touchability level for each region by selectively assigning a predetermined weight to the first touchability level according to the second touch information, wherein the second touch information comprises start position information and end position information about a continuous touch, and estimate the optimum touch region based on the calculated second touchability level of each region; and a first controller configured to display a predetermined graphical object on the touch screen based on the optimum touch region.