A piloting assistance system of a platform, and associated method are provided. The system includes a first detector for detecting a windshear able to generate a first alert that the platform is approaching a windshear zone; a second detector for detecting a windshear able to generate a second alert indicating the presence of the platform in the windshear zone; and a guider of the platform. The guider is able to automatically select a first guidance mode when a first alert is generated by the first detector, and to automatically select at least one second guidance mode different from the first guidance mode when a second alert is generated by the second detector. The system includes an information device able to display unified windshear alert information and/or unified information for implementation of a guidance mode, shared by the first alert and the second alert.