Abstract: The invention relates to a method and a system enabling a user to animate an interactive 3D figure known as an agent (2) during an application program, said agent being cut out of the background of the graphic interface of the program from which it is independent. A first file comprising data defining the agent and the animation algorithms thereof is created in a manner known per se. Said data comprises color, texture and meshing parameters relating to the agent. The first file is interpreted by calculating the behavioral parameters of the agent (2) in real time by means of a 3D motor 3D (23, 24) based on recognition of key words pronounced and/or written by the user in order to automatically animate the agent according to predetermined criteria corresponding to said key words or a combination of said key words.