1. An image generating apparatus that generates a motion image of an object, comprising: a coordinate position input unit that inputs a coordinate position on a two-dimensional plane according to an operation of an operator; a motion data storage that stores plural pieces of motion data defining motions of an object present in a virtual three-dimensional space; a motion data determining unit that determines motion data for causing the object to take a motion by using the plural pieces of motion data based on the input coordinate position; an object motion unit that causes the object to take a motion using the determined motion data; a motion image generating unit that generates a motion image of the object by performing perspective transformation of the object made to take a motion with a virtual camera set to a predetermined position in the virtual three-dimensional space; and a motion image display control unit that effects a display of the generated motion image of the object.