1. A method for detecting a location of a laser point on a screen of a screen projection system, the method comprising: acquiring a first image frame captured by a first camera of a plurality of cameras, each of the plurality of cameras configured to capture an image in an associated one of a corresponding plurality of screen areas of a screen; detecting whether a first laser point projected on the screen by a laser pointer exists in the first image frame; using the first laser point as a laser point on the screen when the first laser point exists in the first image frame and no laser point exists in an image frame captured by any camera of the plurality of cameras other than the first camera; and acquiring information about a location of the first laser point on the screen.