Abstract: When a terminal device accesses through a communication network for the first time, a server device generates an identifier for use in reconnection of the terminal device with the communication network, and returns the identifier to the terminal device. If a connection between the terminal device and communication network is broken by a fault, the server device authenticates the terminal device using the identifier transmitted from the terminal device to recover a connection with another terminal which had been connected immediately before the terminal device was disconnected from the communication network.

Abstract: The present invention provides a composite picture information system that is able to compose pictures from digital data from separate sources. An extended (main) information processor (40) is mechanically configured so that an auxiliary information processor (10) can be docked with it. The extended and auxiliary information processors are each configured so that they can be independently operated and can each provide as an output an analog video signal defining a picture. When the information processors are docked, the auxiliary information processor stops generating its own video signal. Instead, it reads out digital display data based on a synchronizing signal provided by an extended (main) information processor, and provides its digital data to the extended (main) information processor.