A device and a method for arranging 3D(Dimensional) objects are provided to express a result of alpha blending correctly by arranging the 3D semitransparent objects effectively without additional improvement of hardware based on position comparison of the 3D semitransparent objects. An object determiner(201) extracts a representative plane for a plurality of objects displayed in a screen and determines whether each object is deeper in one coordinate axis. An object arranger(202) arranges the objects in a viewing coordinate system. A position calculator(203) determines order for arranging the objects by using a central point and a plane vector of one object with the central point of the compared object. An executor(204) sequentially arranges and renders the position of the objects based on a comparison result. The object determiner determines a determination rule by using a length ratio of other edges excluding the longest edge among the edges forming the object.
