The subject of the invention is to provide a multi-lamp drive system which can drive a plurality of discharge lamps in parallel more effectively, can further increase the brightness uniformity of a plurality of discharge lamps, provides the multi-lamp drive system, and can adjust the brightness of a plurality of discharge lamps to be different mutually according to the brightness characteristics of images which are displayed on a passive type display. The multi-lamp drive system comprises a power transformer which is provided with alternating-current power supply from an alternating-current power supply supply source and produces positive voltage (V p) and negative voltage (V n) and a current balance distributer which is applied with the positive voltage of the power transformer and is divided into a plurality of voltages, wherein the voltage which is divided is respectively applied to a first electrode of a plurality of discharge lamps, the magnitude of current is distributed to balance the current value which is input into each discharge lamp mutually, and the negative voltage of the power transformer is commonly applied to a second electrode of a plurality of discharge lamps.