A domain name system DNS network system, comprising: a local DNS server of at least one network operator, configured to receive a domain-name parsing request from a client terminal of the at least one network operator, and send the domain-name parsing request from a root server to a lower-level authoritative DNS server level by level for performing a recursive query; an upper-level authoritative DNS server, configured to, when receiving the domain-name parsing request from the local DNS server, notify the local DNS server that an info server has been authorized; the info server, storing at least one type of NS record of an external authorized server, configured to, when receiving the domain-name parsing request from the local DNS server, provide a corresponding NS record to the local DNS server, such that the local DNS server accesses the external authorized server; the external authorized server, when established, configured to register and obtain authorization from the info server, and store at least one IP address and geographical location information of the at least one network operator having a one-to-one correspondence relationship with the at least one IP address, wherein the geographical location information of the at least one network operator each associates with an A-record of a corresponding lower-level authoritative DNS server, the external authorized server being configured to, when receiving the domain-name parsing request from the local DNS server, match a public IP of the local DNS server with the at least one IP address to locate the geographical location information of a corresponding network operator, and provide the A-record of the corresponding lower-level authoritative DNS server associated with the network operator to the local DNS server for the local DNS server to access; and the lower-level authoritative DNS server, configured to parse the domain-name parsing request, when receiving the domain-name parsing request sent by the local DNS server, to provide a domain-name parsing result to the local DNS server. a local DNS server of at least one network operator, configured to receive a domain-name parsing request from a client terminal of the at least one network operator, and send the domain-name parsing request from a root server to a lower-level authoritative DNS server level by level for performing a recursive query; an upper-level authoritative DNS server, configured to, when receiving the domain-name parsing request from the local DNS server, notify the local DNS server that an info server has been authorized; the info server, storing at least one type of NS record of an external authorized server, configured to, when receiving the domain-name parsing request from the local DNS server, provide a corresponding NS record to the local DNS server, such that the local DNS server accesses the external authorized server; the external authorized server, when established, configured to register and obtain authorization from the info server, and store at least one IP address and geographical location information of the at least one network operator having a one-to-one correspondence relationship with the at least one IP address, wherein the geographical location information of the at least one network operator each associates with an A-record of a corresponding lower-level authoritative DNS server, the external authorized server being configured to, when receiving the domain-name parsing request from the local DNS server, match a public IP of the local DNS server with the at least one IP address to locate the geographical location information of a corresponding network operator, and provide the A-record of the corresponding lower-level authoritative DNS server associated with the network operator to the local DNS server for the local DNS server to access; and the lower-level authoritative DNS server, configured to parse the domain-name parsing request,