PROBLEM TO BE SOLVED: To provide a cooperation device for an energy management system, an energy management network, a cooperation method, and a program, capable of contributing to improvement of construction easiness and cooperation easiness of a network for the energy management system.SOLUTION: A cooperation device for an energy management system comprises: a communication unit that with an energy management system comprising a radio communication unit for acquiring, via radio communication, operation states of a plurality of devices for using or generating energy and a control unit for controlling at least one of the plurality of devices on the basis of the operation states of the plurality of devices, connects as the device; and a device communication unit that communicates with a second device to acquire an operation state of the second device. The communication unit can connect with a plurality of energy management systems and transmits the operation state of the second device to the plurality of energy management systems.SELECTED DRAWING: Figure 1
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