A method for control-processing an electric device, which implements an operational action indicated by an operational command received from a control terminal, comprises the steps of: determining whether a received operational command is a predetermined operational command; and, if the received operational command is the predetermined operational command, notifying, without implementing the operational action indicated by the operational command, the control terminal that the operational action indicated by the operational command was not implemented. In this way, for example, in a case where an industry-standard command specification has been established, it can be ensured that even when an electric device receives any command that is not supported thereby, the electric device is smoothly controlled.