In a license management system, a terminal apparatus and a server apparatus are connected via a network, and the server apparatus manages licenses of software in the terminal apparatus. In this license management system, when the server apparatus receives a request to re-authenticate a license that has previously be authenticated from the terminal apparatus, the server performs re-authentication of the license based on different pieces of terminal identification information and a plurality of pieces of device information that have been transmitted from the terminal apparatus, and a plurality of pieces of device information that have been stored due to authentication processing.