A method performed by an apparatus for implementing a composed virtual private network, VPN, the method comprising: obtaining by the apparatus a business type and a customer site that are input by a user, wherein the business type indicates a network layer; determining by the apparatus an access point corresponding to the customer site; determining by the apparatus one or more segment VPNs according to the business type and the access point corresponding to the customer site, wherein a segment VPN is a VPN deployed in a domain; obtaining by the apparatus a composed VPN according to the one or more segment VPNs wherein a composed VPN is a VPN deployed across one or more segments; and outputting by the apparatus an access point list and a segment VPN list of the composed VPN to the user, wherein the access point list of the composed VPN comprises information used to describe an access point of the composed VPN, the access point of the composed VPN is the access point corresponding to the customer site, and the segment VPN list comprises information used to describe the one or more segment VPNs; wherein the determining one or more segment VPNs according to the business type and the access point corresponding to the customer site comprises: determining, based on a business type library obtained by means of business orchestration, a business policy and a primary domain that correspond to the business type, wherein a business policy of the primary domain is the same as the business policy corresponding to the business type, the business policy is any one of the following business policies: a Layer 2 VPN, L2VPN, a Layer 3 VPN, L3VPN, or a Termination Point, TP, and the business type library comprises a correspondence between the business type, the business policy, and the primary domain; determining, by using the primary domain as a target, a business access path of the access point corresponding to the customer site, wherein a destination node of the business access path is a boundary node of the primary domain; and determining the one or more segment VPNs according to a domain passed through by the business access path, wherein the segment VPN indicates a business connection in the domain passed through by the business access path, wherein an access point refers to a port of a Provider Edge, PE, device. obtaining by the apparatus a business type and a customer site that are input by a user, wherein the business type indicates a network layer; determining by the apparatus an access point corresponding to the customer site; determining by the apparatus one or more segment VPNs according to the business type and the access point corresponding to the customer site, wherein a segment VPN is a VPN deployed in a domain; obtaining by the apparatus a composed VPN according to the one or more segment VPNs wherein a composed VPN is a VPN deployed across one or more segments; and outputting by the apparatus an access point list and a segment VPN list of the composed VPN to the user, wherein the access point list of the composed VPN comprises information used to describe an access point of the composed VPN, the access point of the composed VPN is the access point corresponding to the customer site, and the segment VPN list comprises information used to describe the one or more segment VPNs; wherein the determining one or more segment VPNs according to the business type and the access point corresponding to the customer site comprises: determining, based on a business type library obtained by means of business orchestration, a business policy and a primary domain that correspond to the business type, wherein a business policy of the primary domain is the same as the business policy corresponding to the business type, the business policy is any one of the following business policies: a Layer 2 VPN, L2VPN, a Layer 3 VPN, L3VPN, or a Termination Point, TP, and the business type library comprises a correspondence between the business type, the business policy, and the primary domain; determining, by using the primary domain as a target, a business access path of the access point corresponding to the customer site, wherein a destination node of the business access path is a boundary node of the primary domain; and determining the one or more segment VPNs according to a domain passed through by the business access path, wherein the segment VPN indicates a business connection in the domain passed through by the business access path, wherein an access point refers to a port of a Provider Edge, PE, device. determining, based on a business type library obtained by means of business orchestration, a business policy and a primary domain that correspond to the business type, wherein a business policy of the primary domain is the same as the business policy corresponding to the business type, the business policy is any one of the following business policies: a Layer 2 VPN, L2VPN, a Layer 3 VPN, L3VPN, or a Termination Point, TP, and the business type library comprises a correspondence between the business type, the business policy, and the primary domain; determining, by using the primary domain as a target, a business access path of the access point corresponding to the customer site, wherein a destination node of the business access path is a boundary node of the primary domain; and determining the one or more segment VPNs according to a domain passed through by the business access path, wherein the segment VPN indicates a business connection in the domain passed through by the business access path, wherein an access point refers to a port of a Provider Edge, PE, device.