System and method for providing user with services

A system for providing a predetermined service to a user through a predetermined program executed on a client terminal, comprising:

• a server;
• and
• a client terminal communicatively coupled to the server, wherein
• the system realizes provision of the predetermined service to a login user who is logged in to the server through the predetermined program with predetermined communication between the server and the client terminal,
• the client terminal includes a terminal-side storage storing confirmation information in a dedicated region of the predetermined program,
• the server includes a server-side storage storing the confirmation information of each user,
• wherein the predetermined communication includes:
• transmitting to the server, by the client terminal, a request to which the confirmation information stored in the terminal-side storage is attached;
• checking, by the server, validity of the request based on comparison between the confirmation information attached to the request from the client terminal and the confirmation information of the login user stored in the server-side storage;
• updating, by the server, the confirmation information of the login user according to a predetermined update rule;
• transmitting, by the server, a response to the request to the client terminal;
• and
• updating, by the client terminal, in response to the response from the server to the request, the confirmation information stored in the terminal-side storage according to the predetermined update rule.