A network resource management method, comprising: receiving, by a first management unit, a service request message, wherein the service request message is used to manage a target service, and the service request message carries target-service requirement information; and obtaining a network resource based on the target-service requirement information via: - when the first management unit determines that there is a network resource that meets the target-service requirement information: determining, by the first management unit based on the service request message, a network resource that meets the target-service requirement information; and - when the first management unit determines that there is no network resource that meets the target-service requirement information: determining, by the first management unit based on the service request message, network resource requirement information corresponding to the target-service requirement information, and sending, by the first management unit, a resource request message to a second management unit, wherein the resource request message is used to request a network resource, and the resource request message carries the network resource requirement information. receiving, by a first management unit, a service request message, wherein the service request message is used to manage a target service, and the service request message carries target-service requirement information; and obtaining a network resource based on the target-service requirement information via: - when the first management unit determines that there is a network resource that meets the target-service requirement information: determining, by the first management unit based on the service request message, a network resource that meets the target-service requirement information; and - when the first management unit determines that there is no network resource that meets the target-service requirement information: determining, by the first management unit based on the service request message, network resource requirement information corresponding to the target-service requirement information, and sending, by the first management unit, a resource request message to a second management unit, wherein the resource request message is used to request a network resource, and the resource request message carries the network resource requirement information. - when the first management unit determines that there is a network resource that meets the target-service requirement information: determining, by the first management unit based on the service request message, a network resource that meets the target-service requirement information; and - when the first management unit determines that there is no network resource that meets the target-service requirement information: determining, by the first management unit based on the service request message, network resource requirement information corresponding to the target-service requirement information, and sending, by the first management unit, a resource request message to a second management unit, wherein the resource request message is used to request a network resource, and the resource request message carries the network resource requirement information.