A storage medium containing a computer program causing a computer connectable to an electric power generator to operate as a communications device, the computer program causing the computer to execute the steps of:
- (q) receiving a request for a transmission addressed to the communications device via the Internet from a managing device having timing decision means for deciding timings to transmit a request for a transmission of generated power quantity information for electric power generators to be managed;
- and
- (r) transmitting generated power quantity information indicating a generated power quantity for the electric power generator connected to the communications device back to the managing device in response to the request.