If a first SIM card in a terminal device has been registered with a first service provider, when needs to subscribe to a second service provider for registration, the terminal device sends a subscription indication and a subscription identity to a second service provider server. The second service provider server acquires service registration information from a first service provider server according to the subscription indication and the subscription identity, generates a second profile for accessing a second service provider network based on the service registration information which is used by the first SIM card to access a first service provider network. The second profile is generated based on existing service registration information, so the terminal device subscribes to the second service provider for registration. After performing subscription for registration once, no need to submit an identity for verification again, user operations are simplified and user experience is improved.