An apparatus for processing an animation includes an animation control unit configured to determine an animation processing mode as an interpolated animation mode or a cascading style sheets level 3 (CSS3) animation mode according to a property of the animation, the property being received through an application program interface (API), an animation engine unit configured to calculate a matrix of an object for each frame and to process the animation based on the calculated matrix if the animation processing mode is determined as the interpolated animation mode, and a web engine unit configured to process the animation based on a target matrix of the object and CSS 3 transition if the animation processing mode is determined as the CSS3 animation mode.