The present invention relates to a billiard teaching system that interlocks online and offline. In the present invention, the wireless Internet is possible, and a first terminal in which an application including a plurality of textbook data is installed so as to learn billiard technology therein, is connected to the first terminal and the Internet to receive textbook data from the first terminal. A server, a second terminal connected to the Internet with the central server to receive textbook data from the central server, and data communication with the second terminal, including a module capable of data communication inside, receives textbook data and projects the textbook data in the direction of gravity It includes a beam projector and a billiard table spaced apart from the beam projector in the direction of gravity to display teaching material data output from the beam projector. And it is installed spaced apart from the beam projector, further comprising a shooting calculation module for detecting the guide path displayed on the billiard table and billiard balls placed on the billiard table through the textbook data, and calculates the matching rate between the moving path and the guide path of the billiard ball Can. Through this, the present invention enables learners to acquire theoretical knowledge of billiard technology at a desired time and place, and to acquire real billiard technology more quickly and effectively offline through acquired reality simulation.
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