An automatic detection method of a video wall arrangement for a video wall system comprising a plurality of monitors and a control computer, wherein each of the plurality of monitors comprises a control portion (20, 60) arranged to control the monitor and to store an identification number of the monitor; and four detecting members (30-1, 30-2, 30-3, 30-4) disposed on four side surfaces of the monitor, the automatic detection method comprising: a) causing the control computer to call up a first identification number among the plurality of monitors; b) causing a monitor corresponding to the first identification number among the plurality of monitors to send a response signal through four detecting members (30-1, 30-2, 30-3, 30-4) disposed on four side surfaces of the monitor; c) causing other monitors which do not correspond to the first identification number to detect whether the response signal enters through the four detecting members (30-1, 30-2, 30-3, 30-4) disposed on the four side surfaces of each of the other monitors and to send detecting signals comprising a detecting result to the control computer; d) causing the control computer to receive the detecting signals sent from the other monitors; e) causing the control computer to sequentially call up a plurality of identification numbers corresponding to the plurality of monitors and repeat the steps of b), c) and d) to receive the detecting signals; and f) after all the plurality of identification numbers corresponding to the plurality of monitors is called, causing the control computer to determine an arrangement of the plurality of monitors based on the received detecting signals by matching the identification numbers and the locations of the plurality of monitors and to display the determined arrangement, wherein the identification number of each of the plurality of monitors is displayed with an image portion presenting each of the plurality of monitors; wherein a monitor which does not correspond to the first identification number among the plurality of monitors determines a detecting member (30-1, 30-2, 30-3, 30-4) through which the response signal enters of the four detecting members (30-1, 30-2, 30-3, 30-4), and sends location information of the detecting member (30-1, 30-2, 30-3, 30-4) through which the response signal enters to the control computer; and wherein the control computer uses an identification number of the monitor and the location information of the detecting member (30-1, 30-2, 30-3, 30-4) comprised in the detecting signal to determine the arrangement of the plurality of monitors. a) causing the control computer to call up a first identification number among the plurality of monitors; b) causing a monitor corresponding to the first identification number among the plurality of monitors to send a response signal through four detecting members (30-1, 30-2, 30-3, 30-4) disposed on four side surfaces of the monitor; c) causing other monitors which do not correspond to the first identification number to detect whether the response signal enters through the four detecting members (30-1, 30-2, 30-3, 30-4) disposed on the four side surfaces of each of the other monitors and to send detecting signals comprising a detecting result to the control computer; d) causing the control computer to receive the detecting signals sent from the other monitors; e) causing the control computer to sequentially call up a plurality of identification numbers corresponding to the plurality of monitors and repeat the steps of b), c) and d) to receive the detecting signals; and f) after all the plurality of identification numbers corresponding to the plurality of monitors is called, causing the control computer to determine an arrangement of the plurality of monitors based on the received detecting signals by matching the identification numbers and the locations of the plurality of monitors and to display the determined arrangement, wherein the identification number of each of the plurality of monitors is displayed with an image portion presenting each of the plurality of monitors;