When a visitor's external device enters the enterprise network, the guest access management module can provide automatic visitor reservation application, and activate the network through automatic permission, manual permission, and respondent permission. Visitors who use reservation application will obtain Pin Code in advance, enter Pin Code on the application connection page after entering the enterprise network, and then activate the network. All visitors can set access permissions and access time limits for the intranet and extranet. When the time limit expires, the system will automatically reclaim the permissions. The automated mechanism facilitates the definition and management of visitors, and can produce detailed record reports for audit.