An implementation method of a broadband network system, the method comprising: transmitting, by a terminal, an IP address request message to a network side (S 10); receiving, by the network side, the IP address request message, and returning, by the network side, a non-IP-address Endpoint Identifier, EID, of the terminal (S 20); and using, by the terminal, the received EID as an address to transmit and receive packets (S 30), wherein the EID of the terminal comprises at least one of: national identification number, passport number, driver's license number, domain name system number, defined numbering system, and telephone number of a user using the terminal, and wherein before transmitting, by the terminal, the IP address request message to the network side (S 10), the method further comprises: performing, by the terminal, PPP over Ethernet, PPPoE, user authentication with the network side, and passing, by the terminal, the authentication; and using, by the terminal, the received EID as the address to transmit and receive the packets (S 30) comprises: using, by the terminal, the received EID as a source address to perform EID packet encapsulation for service data, performing, by the terminal, PPPoE frame encapsulation for the EID-encapsulated packet, and transmitting, by the terminal, the PPPoE-encapsulated frame; analyzing, by a Broadband Remote Access Server, BRAS, at the network side, the received PPPoE-encapsulated frame, and searching, by the BRAS, a Routing Locator, RLOC, address corresponding to a destination EID carried in the analyzed EID-encapsulated packet according to the corresponding relationship between EID and RLOC; and performing, by the BRAS, IP packet encapsulation for the EID-encapsulated packet according to the searched RLOC address, and transmitting, by the BRAS, the IP-encapsulated IP packet. transmitting, by a terminal, an IP address request message to a network side (S 10); receiving, by the network side, the IP address request message, and returning, by the network side, a non-IP-address Endpoint Identifier, EID, of the terminal (S 20); and using, by the terminal, the received EID as an address to transmit and receive packets (S 30), wherein the EID of the terminal comprises at least one of: national identification number, passport number, driver's license number, domain name system number, defined numbering system, and telephone number of a user using the terminal, and wherein before transmitting, by the terminal, the IP address request message to the network side (S 10), the method further comprises: performing, by the terminal, PPP over Ethernet, PPPoE, user authentication with the network side, and passing, by the terminal, the authentication; and using, by the terminal, the received EID as the address to transmit and receive the packets (S 30) comprises: using, by the terminal, the received EID as a source address to perform EID packet encapsulation for service data, performing, by the terminal, PPPoE frame encapsulation for the EID-encapsulated packet, and transmitting, by the terminal, the PPPoE-encapsulated frame; analyzing, by a Broadband Remote Access Server, BRAS, at the network side, the received PPPoE-encapsulated frame, and searching, by the BRAS, a Routing Locator, RLOC, address corresponding to a destination EID carried in the analyzed EID-encapsulated packet according to the corresponding relationship between EID and RLOC; and performing, by the BRAS, IP packet encapsulation for the EID-encapsulated packet according to the searched RLOC address, and transmitting, by the BRAS, the IP-encapsulated IP packet. performing, by the terminal, PPP over Ethernet, PPPoE, user authentication with the network side, and passing, by the terminal, the authentication; and using, by the terminal, the received EID as the address to transmit and receive the packets (S 30) comprises: using, by the terminal, the received EID as a source address to perform EID packet encapsulation for service data, performing, by the terminal, PPPoE frame encapsulation for the EID-encapsulated packet, and transmitting, by the terminal, the PPPoE-encapsulated frame; analyzing, by a Broadband Remote Access Server, BRAS, at the network side, the received PPPoE-encapsulated frame, and searching, by the BRAS, a Routing Locator, RLOC, address corresponding to a destination EID carried in the analyzed EID-encapsulated packet according to the corresponding relationship between EID and RLOC; and performing, by the BRAS, IP packet encapsulation for the EID-encapsulated packet according to the searched RLOC address, and transmitting, by the BRAS, the IP-encapsulated IP packet. using, by the terminal, the received EID as a source address to perform EID packet encapsulation for service data, performing, by the terminal, PPPoE frame encapsulation for the EID-encapsulated packet, and transmitting, by the terminal, the PPPoE-encapsulated frame; analyzing, by a Broadband Remote Access Server, BRAS, at the network side, the received PPPoE-encapsulated frame, and searching, by the BRAS, a Routing Locator, RLOC, address corresponding to a destination EID carried in the analyzed EID-encapsulated packet according to the corresponding relationship between EID and RLOC; and performing, by the BRAS, IP packet encapsulation for the EID-encapsulated packet according to the searched RLOC address, and transmitting, by the BRAS, the IP-encapsulated IP packet.