An electromagnetic input device includes a handheld magnetized stylus, an electromagnetic input panel including an induction layer, a controller, and a storage device. The induction layer includes a plurality of closed-loop inductor coils which output an induced current when experiencing the magnetic flux of the stylus. The storage device stores a pre-determined table recording mapping relationship between location coordinates of the stylus on the electromagnetic input panel in each of the inductor coils, and intensities of the corresponding induced current generated therein. The controller determines which inductor coil generates the induced current, and the intensity of the induced current, and further determines the location of the stylus on the electromagnetic input panel based upon determined inductor coil which generates the induced current and the intensity of the induced current generated therein, and the pre-determined table.