Authorization system and authorization method

Abstract

[Problem] Provided is an authorization system capable of reducing a load on a host regarding an invitation procedure in a case where there is a large number of guests or guests are frequently invited, and preventing identity theft or invitation of an unwanted third party. [Solution] In an authorization systemX, a representative guest terminalA acquires information about non-representative guest terminalsB andC from the non-representative guest terminalB andC, a host terminalH acquires and verifies signed information about the terminalsA,B, andC from the representative guest terminalA, and a management serveracquires and verifies the information about the host terminalH and the signed information about the terminalsA,B, andC from the host terminalH, performs authentication based on information about the host terminalH registered in advance, registers the information about the terminalsA,B, andC, when the authentication is successful, acquires and performs authentication on information about the terminalsA,B, andC from a smart lock, and unlocks the smart lockbased on a result of the authentication.