| 摘要 |
A user ID and password are transmitted from a mobile telephone to a web server and whether the mobile telephone has the right to access the web server is authenticated. If the mobile telephone has the right to access the web server, a user ID and password for a first external server stored in a database are transmitted from the web server to the first external server. Authentication processing is executed in the first external server. If it is verified that the mobile telephone has the right to access the first external server, then the first external server generates authentication information and transmits this authentication information to the web server. In a case where the mobile telephone accesses the first external server, the generated authentication information is erased and then the first external server executes authentication processing.
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