REMOTE MAINTENANCE SYSTEM

A remote maintenance system has a center server that is located in a service center for performing maintenance of an electrical appliance and a home server that is located in a house and monitors a status of the electrical appliance 102 in the house which are connected via a communication network. The home server includes an electrical appliance management unit that acquires a status value of the electrical appliance, a communication unit that receives from the center server a failure model which is information defining a method of deriving a decision whether the electrical appliance has failed or not from the status value, and a failure deciding unit that decides whether the electrical appliance has failed or not based on the acquired status value and the received failure model using qualitative reasoning. The center server includes a failure model updating unit that updates a failure model and sends the updated failure model to the home server via a communication unit.