A billiard ball striking assistance method, a billiard ball striking assistance system (240), and a portable electronic device (200). The billiard ball striking assistance method comprises: acquiring a photograph or video of a billiard tabletop (100) and the ball striking action of the player (110) (S101); analysing the photograph or video to detect a ball striking path corresponding to the action of the player (S102); and, on the basis of the detected ball striking path, outputting ball striking assistance information (S103).
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