A remote control system, comprising: a home appliance; and a device adapter configured to relay transmission of an operation instruction to remotely control the home appliance, the operation instruction being transmitted from a server disposed outside of home, to relay the transmission of the operation instruction transmitted from the server, and to connect the home appliance to a communication device disposed at home, characterized in that the home appliance comprises: a first detector configured to detect a communication interruption on a first communication line connecting the home appliance and the device adapter and for transmission of the operation instruction from the device adapter to the home appliance; a receiver configured to receive, from the device adapter, an interruption signal indicating a communication interruption on a second communication line connecting the device adapter and the communication device and for transmission of the operation instruction from the communication device to the device adapter; and a state changer configured to change a state of the home appliance in accordance with a duration of at least one of the communication interruption detected by the first detector or the communication interruption indicated by the interruption signal received by the receiver, the device adapter comprises: a second detector configured to detect the communication interruption on the second communication line; and a transmitter configured to transmit the interruption signal to the home appliance when the communication interruption is detected by the second detector. a home appliance; and a device adapter configured to relay transmission of an operation instruction to remotely control the home appliance, the operation instruction being transmitted from a server disposed outside of home, to relay the transmission of the operation instruction transmitted from the server, and to connect the home appliance to a communication device disposed at home, characterized in that the home appliance comprises: a first detector configured to detect a communication interruption on a first communication line connecting the home appliance and the device adapter and for transmission of the operation instruction from the device adapter to the home appliance; a receiver configured to receive, from the device adapter, an interruption signal indicating a communication interruption on a second communication line connecting the device adapter and the communication device and for transmission of the operation instruction from the communication device to the device adapter; and a state changer configured to change a state of the home appliance in accordance with a duration of at least one of the communication interruption detected by the first detector or the communication interruption indicated by the interruption signal received by the receiver, a first detector configured to detect a communication interruption on a first communication line connecting the home appliance and the device adapter and for transmission of the operation instruction from the device adapter to the home appliance; a receiver configured to receive, from the device adapter, an interruption signal indicating a communication interruption on a second communication line connecting the device adapter and the communication device and for transmission of the operation instruction from the communication device to the device adapter; and a state changer configured to change a state of the home appliance in accordance with a duration of at least one of the communication interruption detected by the first detector or the communication interruption indicated by the interruption signal received by the receiver, the device adapter comprises: a second detector configured to detect the communication interruption on the second communication line; and a transmitter configured to transmit the interruption signal to the home appliance when the communication interruption is detected by the second detector. a second detector configured to detect the communication interruption on the second communication line; and a transmitter configured to transmit the interruption signal to the home appliance when the communication interruption is detected by the second detector.