The outdoor display system has a solar cell; an electricity storing unit which stores electricity obtained by the solar cell, and a display apparatus having a displaying portion displaying contents, wherein the apparatus is supplied an electric power from the storing unit or solar cell. The display apparatus may contain a display panel which displays contents; a receiving unit which receives contents transmitted wireless; a backlight which irradiates light to the display panel, and a control unit which controls the displaying of the received contents in the display panel. The control unit may perform the luminosity control of the backlight according to a residual capacity of the electricity storing unit.