An Internet terminal comprising: a communication unit that sends a local packet generated by a packet generation unit and receives a response local packet from a server apparatus; an encryption processing unit that encrypts the local packet to be sent out and decrypts the received response local packet; the packet generation unit that generates the local packet; a polling information storage unit that holds a terminal ID and a password used for identifying the internet terminal; a polling interval adjustment unit that identifies a polling interval at which the local packet is periodically sent to the router; and a control unit that sends control information to a terminal apparatus to be controlled and controls such terminal apparatus accordingly.