Device and method of controlling and switching terminals provided with specific communication systems among a plurality of standard communication system

摘要

A method for controlling and switching terminals includes a writing step and a logoff step. In the writing step, when there is a connection request from a given terminal, a processor of a switching device writes, into a memory, user identification information, a password, identification information of a communication system, and an IP address and port number so that their information and data are associated with one another. In the logoff step, if the same user identification information, password, and identification information of communication system as the above are already written in the memory, the processor logs off the other terminal that has the IP address and port number that are already so written in the storage unit as to be associated with the user identification information, the password, and the identification information of communication system.