| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic address assignment method which prevents wrong access to the terminal of an information provider which will next use a network address. SOLUTION: When being executing an authentication program 63 in an HDD 34, a CPU 31 of a dial-up server device 30 included in a server device group 100 manages authentication of a terminal 20 for information provider accessing the server device group 100 and leases an idle IP address to the terminal 20 and informs a name server device 40 of the IP address. When being executing a ddns program 66 in an HDD 44, a CPU 41 of the name server device 40 included in the server device group 100 discriminates whether the terminal 20 to which the UP address has been leased is logged out or not and rewrites an IP address corresponding to the domain name of the terminal 20 in a host table 55 with an IP address of a proxy response server for responding in place of the terminal 20 in the case of logout.
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