Painting method for interacting motion of multiple bodies is described. It is based on the method to paint the moving picture of a single body which is either rigid or flexible. The moving picture of each body is painted concurrently. Affine transformation and motion vector are used to paint the moving picture. The system interpolates the parameters given by the painter along the time passage. In order to paint the moving picture of a flexible body, the painter defines the region which he wants to move on the still picture. It means that geometrical space is divided. To paint the moving picture with interactive motion, the time interval of the moving picture is divided into the period of motion with interaction and that of motion without interaction. The moving picture is painted in a set of time periods. Thus, both geometrical space and time period are divided, and picture painting proceeds sequentially in both fields.