To provide a privilege application service management system for safely using user authentication information, reducing any labor on a user or a store, and managing the privilege application services of each store in a batch.

A server 2 includes a session ID issue task 24 for issuing session ID and a user authentication information determination task 26. A client terminal 3 includes a two-dimensional code generation task 33 for generating a two-dimensional code Q from user identification information with time information hashed by adding time information to the identification information of a user M, session ID, and time information. A store terminal 4 includes: a two-dimensional code acquisition task 43 for acquiring user authentication information T on the basis of the two-dimensional code Q from the client terminal 3; and an inquiry task 44 for transmitting the user authentication information T to the server 2. When acquiring the user authentication information T, the user authentication information determination task 26 determines whether or not the user has joined a privilege application service.