Remote service system

A remote service system comprising:

• a first computer terminal configured to add a first signature to control information representing control content to be applied to a facility and transmit the control information;
• and
• a second computer terminal configured to cause the control content represented by the control information to be applied to the facility,
• wherein the first computer terminal and the second computer terminal are connected by a first communication network,
• wherein the second computer terminal and the facility are connected by a second communication network,
• wherein the remote service system further comprises a third computer terminal connected to the first communication network and configured to further add a second signature to the control information and transmit the control information when the first signature added to the control information is a correct signature and the control information represents the control content applicable to the facility,
• wherein the control information is change information representing change content for changing a setting condition of the facility,
• wherein the first computer terminal is configured to receive the change content for the facility, add the first signature to the change information representing the received change content, and transmit the change information,
• wherein the third computer terminal is configured to further add the second signature to the change information and transmit the change information when the first signature added to the change information is a correct signature and the change information represents the change content applicable to the facility, and
• wherein the second computer terminal is configured to cause the change content represented by the change information to be applied to the facility.