In recent years, presentation with computer is important as a social skill to transfer knowledge and information, but presentation practice is depending on the know-how, such as instructor's experiences or textbooks. We have developed a presentation practice support system, named PRESENCE, to improve beginners' demonstration of presentation. The PRESENCE has the real-time voice feedback function to recover undesirable states. As the basic skills of presentation to support beginners, the voice feedback function has been implemented to check body expression such as “the vertical direction of face”, “the horizontal direction of body” and voice expression as “the voice volume”. The effects of PRESENCE to beginners' presentation were investigated by comparing those without the feedback function. The results showed that PRESENCE significantly improved the voice expression, and significantly changed the movement of the body expression.