Power coordination control systems (10a-10c) are provided with superimposed signal generation units (11a-11c), transmission units (12a-12c), receiving units (13a-13c) and connection relation estimation units (14a-14c). At the location of a utility consumer A (20), the superimposed signal generation unit (11a) generates a superimposed signal by superimposing a prescribed signal on a voltage supplied from a system (50). The transmission unit (12a) transmits the superimposed signal generated in the superimposed signal generation unit (11a) from the utility consumer A (20) to utility consumers B (30) and C (40). The receiving unit (13b) receives the superimposed signal at the location of the utility consumer B (30). The connection relation estimation units (14a-14c) estimate the connection relation between the utility consumer A (20) and the utility consumer B (30) on the basis of the receiving status of the superimposed signal and/or the received information received by the receiving units (13a-13c).
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