An electric-power management administration system includes an electric-power management administration device adapted to administer charging/discharging of a first charging/discharging system and a second charging/discharging system, wherein the first charging/discharging system and the second charging/discharging system is each connected to a first electric-power supply system and a second electric-power supply system through an electric-power network and is each connected to a first electric-power demand system and a second electric-power demand system, the plurality of charging/discharging systems includes charging/discharging systems having different charging/discharging efficiencies, the plurality of electric-power supply systems includes electric-power supply systems having different electric-power generation schemes, and the electric-power management administration device sets a charging/discharging plan for the respective charging/discharging systems, based on the charging/discharging efficiencies, and based on priorities for improving electric-power efficiency, which are associated with the electric-power generation schemes.