A control system including a control device, which is connected to a power storage device capable of supplying power to one or more electric apparatuses, and a server, by which reduction in a communication load and appropriate charge/discharge control are both achieved, is provided. When acquiring weather information from a server, a control device, on the basis of the weather information, charge to the power storage device and power supply from the power storage device to the electric apparatus. The control device decides a period from timing at which the weather information is acquired to timing at which weather information is next acquired. At second timing at which the period has elapsed from first timing at which the weather information has been acquired, the control device repeats an operation from acquisition of weather information to decision of a period after which weather information is next acquired from the server.