Abstract: A remote monitoring system includes a remote monitoring apparatus and a network server. The network server is configured to request, a) when there is no missing portion in an operating state obtained from the remote monitoring apparatus until now, the remote monitoring apparatus to transmit an operating state newly recorded after previous obtainment of the operating state. The network server is configured to request, b) when there is a missing portion in the operating state obtained from the remote monitoring apparatus until now, the remote monitoring apparatus to transmit the operating state newly recorded after previous obtainment of the operating state and the missing portion that remains in a storage device.

Abstract: A remote monitoring device configured to communicate with an external device via a public communication line and send, to an air-conditioning apparatus, an operation instruction signal for operating the air-conditioning apparatus, includes a monitoring-side line communication unit configured to communicate with the external device via the public communication line, a monitoring-side dedicated line communication unit configured to communicate with the air-conditioning apparatus via a dedicated communication line, a monitoring-side data storage unit storing air-conditioning operation data set by a user of the air-conditioning apparatus and indicates operation contents of the air-conditioning apparatus for a case of a communication disruption, and a monitoring-side control unit configured to generate the operation instruction signal based on the air-conditioning operation data when determining that a communication with the external device via the public communication line is disrupted, and send the operation ins