Single sign-on method and apparatus

The present invention discloses a method of single sign-on, wherein the at least one service provider on the internet servers and internet user access server, comprising: intercepting a request sent by a user via client browser; extracting the domain name included in the request; determining type of the domain name; in response to the type of the domain name is the domain name of the original platform server generates a global session ID, that uniquely identifies a session between the user and the internet server; new internet domain name server generates a global session ID associated therewith; the URL redirects the request to the URL that contains the new platform has a new domain name server; the platform server forwards the request contains the URL of the new server platform there.