The present invention relates to an animation authoring system and a method for authoring animation, and more particularly, to an animation authoring system and a method for authoring animation which enables beginners to easily author a three-dimensional animation in which input ambiguity problems in three-dimensional environments have been solved. According to the present invention, the animation authoring system comprises the following steps: a) receiving a plane route of an object on a predetermined reference plane from a user; b) generating an operation window which is formed along the plane route and has a predetermined angle with the reference plane, and receiving operation information of the object on the operation window from the user; and c) implementing an animation according to the received operation information.
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