A connection method is a connection method for a case where a terminal inside home is connected to a router inside home connected to a first network. This connection method includes: an acquisition step of acquiring, by a portable terminal, connection information used for connection for the portable terminal to make direct communication with the terminal inside home from a support server connected to the first network; and a storage step of storing the connection information acquired in the acquisition step in the portable terminal. The connection information includes an IP address and port number which are set in the router inside home to correspond to the terminal inside home.