A network system includes a terminal apparatus, a network home appliance, a service server that provides the terminal apparatus with a service for controlling the network home appliance through a network, and a direct access management server that performs exchange of information necessary for directly accessing the network home appliance through the network. The network home appliance includes a first storing unit that stores setting information for setting necessity of message transmission concerning an event that occurs in the network home appliance and a message transmitting unit that judges necessity of transmission of a message concerning the event and transmits the message. The direct access management server includes a first message-transmission processing unit that specifies the service server and transmits the message to the service server. The service server includes a second message-transmission processing unit that specifies a destination of the terminal apparatus and transmits the message to the destination.