A holographic recording and reproduction system includes a servo optical path, which is used to provide a servo mechanism, so that holographic interference fringes can be stored continuously into a holographic recording medium, and when the reproduction signals are desired, they can be fetched and obtained swiftly and accurately by making use of the servo mechanism. In one embodiment, a task dependent unified language model is created. In this way a direct sale of goods is done with high reliability on the Internet between the authorized member and the authorized shop. Small diameter rollers, very closely spaced, are affixed to a surface of the first side plate to support the conveyor belt and reduce friction between the side plate and the conveyor belt.