for performing concentrated access of each boss subsystem the boss subsystem is configured to send a business processing request to the specified hlr subsystem the specified hlr subsystem is configured to forward the business processing request to a corresponding non specified hlr subsystem and the non specified hlr subsystem is configured to feed business processing information back to the boss subsystem by the specified hlr subsystem the hlr subsystem includes an hlr database a concentrated access interface machine and at least one data access server wherein the concentrated access interface machine of the specified hlr subsystem is configured to set up connection with a data access server of each hlr subsystem and exchange the business processing information between the boss subsystem and a data access server of each hlr subsystem the concentrated access interface machine of the hlr subsystem specified for concentrated access is further configured to query and select an object to which the request is to be sent according to user identifiers included in the business processing request the concentrated access interface machine of the hlr subsystem specified for concentrated access is further configured to select a data access server according to a current load condition of each data access server when a data access server for receiving the business processing information cannot be determined the concentrated access interface machine of the hlr subsystem specified for concentrated access is further configured to update a historical distribution record of the business processing information according to an exchange condition of the business processing information with respect to fig2 the concentrated access interface machine directly accesses a data access server at each location of the distributed hlr the access process is as shown in fig3 including the following steps step 301.