The present invention achieves real-time pricing by impartially selecting a consumption location at which a subject of consumption is consumed without gathering in one location the information of the consumption locations at which the subject of consumption is attempted to be consumed. The supply/demand balancing system (real-time pricing system) (100) is provided with: a limitation parameter setting unit (21) that sets a limitation parameter on the basis of the excess supply capacity for electrical power; and a plurality of switching systems (automated demand response devices) (30) respectively connected between a plurality of power consuming apparatuses (40) and an electrical power source (10). Each of the plurality of switching systems (30) is provided with: a drawing unit (33) that performs a drawing at a winning probability on the basis of the limitation parameter; and a switching unit (34) that, when drawn by the drawing unit (33), receives electrical power from the electrical power source (10) and supplies same to a power consuming apparatus (40), and/or when not drawn by the drawing unit (33), blocks the supply of electrical power from the electrical power source (10) to the power consuming apparatus (40).
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