| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of the so-called impersonated connection by a third person illegally acquiring the user ID or password of a terminal owner. SOLUTION: When a connection request to a line is outputted from a portable telephone set 5, a server 23 acquires user ID, a password and a zone number showing the current position of the telephone set 5 from the set 5. Then the server 23 reads out a remote access user management table and respectively compares the user ID, the password and the zone number with registered user ID, password and zone number. Only when all the data completely coincide with each other, the server 23 permits the telephone set 5 to be connected to a remote access point of a LAN 19. If any one of data does not coincide with its reference data, the connection is rejected.
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