To provide a presentation system capable of easily and inexpensively realizing the constitution required for forming coordinates of a pointer mark, further facilitating use, and having high safety.

An infrared light emitting part 53 is juxtaposed in a laser pointer 5 together with a laser beam emitting part 52. A projected image of the infrared light projected on a screen 1 is sensed by a infrared light sensing part 21. The moving direction and a moving distance of the projected image and a button click signal are converted into mouse data, and are supplied to a personal computer 4. An image of reflecting the mouse data from the personal computer 4 is projected on the screen 1 from a projector 2.

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