An information processing terminal device (1) is provided which is reliably connectable to a desired server on the Internet and includes: a cable interface (3) that requests connection to a predetermined server; a connection information obtainment unit (4) that obtains, from the server, connection information which includes an IP address and is necessary for the connection to the server; an obtained IP address obtainment unit (8) that obtains the IP address assigned to a communication interface (2) connected to a different network; an IP address scheme determination unit (7) that determines whether or not the obtained IP address and the IP address included in the connection information have the same address scheme; an IP address setting management unit (6) that determines a method of setting the IP address and the connection information for the cable interface (3) and the communication interface (2); and a connection information setting unit (5) that sets and releases the IP address and the connection information according to the method determined by the IP address setting management unit.