A method for service authorization by a server terminal device, the method comprising: receiving, by one or more processors of the server terminal device, user authentication information that is stored on an auxiliary device associated with a user terminal device, wherein the user authentication information comprises verification information and user identification information; and determining whether the user terminal device meets an authorization condition based on the received user authentication information, wherein a user authentication request is initiated without entering the user authentication information by a user, the method further comprising: receiving the user authentication request prior to receiving the user authentication information, the user authentication request including identifier information of the user terminal device; generating a service serial number based on the user authentication request, the service serial number having a mapping relationship with the user authentication request; wherein the determining whether the user terminal device meets the authorization condition comprises: determining the service serial number corresponding to the user authentication request; identifying the user terminal device based on the identifier information of the user terminal device; determining whether the user terminal device meets the authorization condition. receiving, by one or more processors of the server terminal device, user authentication information that is stored on an auxiliary device associated with a user terminal device, wherein the user authentication information comprises verification information and user identification information; and determining whether the user terminal device meets an authorization condition based on the received user authentication information, wherein a user authentication request is initiated without entering the user authentication information by a user, the method further comprising: receiving the user authentication request prior to receiving the user authentication information, the user authentication request including identifier information of the user terminal device; generating a service serial number based on the user authentication request, the service serial number having a mapping relationship with the user authentication request; wherein the determining whether the user terminal device meets the authorization condition comprises: determining the service serial number corresponding to the user authentication request; identifying the user terminal device based on the identifier information of the user terminal device; determining whether the user terminal device meets the authorization condition. receiving the user authentication request prior to receiving the user authentication information, the user authentication request including identifier information of the user terminal device; generating a service serial number based on the user authentication request, the service serial number having a mapping relationship with the user authentication request; wherein the determining whether the user terminal device meets the authorization condition comprises: determining the service serial number corresponding to the user authentication request; identifying the user terminal device based on the identifier information of the user terminal device; determining whether the user terminal device meets the authorization condition. determining the service serial number corresponding to the user authentication request; identifying the user terminal device based on the identifier information of the user terminal device; determining whether the user terminal device meets the authorization condition.