An information accessing method permits the user data belonging to a
client-server system to be accessed by a user belonging to another
client-server system under proper security and controls the permission for
accessing the user data according to the security ranks of the user whose
data is to be accessed and the user who wants to access the data. When a
client unit issues a request for accessing the user data of the user
belonging to the other client-server system, the request for access is
sent to an ID conversion unit through a user ID management unit. The ID
conversion unit operates to convert a user ID into a guest ID by referring
to an ID conversion table, and then sends the request for access to a user
ID management unit. The user ID management unit makes sure that the guest
ID is registered by referring to the user ID table. Then, the request for
access is sent to the user data management unit through security check
units, so that the whole or the open portion of the user data specified on
the user data is allowed to be accessed.
