Identity management platform, service server, uniform login system and method

The invention relates to an identity management platform which comprises an information receiving module, a query module and an information sending module. The invention further relates to a business server which comprises the information receiving module, the query module and the information sending module. The invention further relates to a unified logging system which comprises a terminal, the identity management platform, a server of a remote user dial-up authentication system, an identity united database and the business server. The invention also relates to a unified logging method. The identity management platform, the business server, the unified logging system and the method which are provided by the invention can realize that the user does not need to carry out the complex identity authentication process again during the business visit after the primary identity authentication of a user in an access GPRS network, thereby complex operation during the user business visit is reduced, and good experience is provided for users, and the safety and the reliability of important information, such as user identity information and the like can be guaranteed.