Patent ID: 7814156

Claim:
An account information management system, comprising: a server that provides at least a mail exchange service and a network game service; and a client terminal connected to said server via a network, said server comprising: a network game server processor that provides the network game service, the network game service providing a network game; a character name memory that stores a character name which a user selects to use and selects to stop using in the network game, the character name being a name of a character used in the network game, said character name memory storing the character name as long as the character name is usable in the network game by the user when the user uses the network game service, regardless of whether the user is currently using the network game service; a character name deleter that deletes the character name from said character name memory when the user stops using the character name in the network game service; a server side account information memory that stores account information used for mail exchange by the user, the account information including a character name mail address having the character name which the user uses in the network game; a change confirmer that periodically confirms whether a change in the account information including the character name mail address occurs; an account information updater that updates the account information stored in said server side account information memory when the change is confirmed to occur; an account information transmitter that transmits the account information stored in said server side account information memory to said client terminal via the network; and a server side mail exchange processor that executes processing for mail exchange with said client terminal based on the account information stored in said server side account information memory, wherein said account information updater deletes the character name mail address including the character name from said server side account information memory when the character name has been deleted from said character name memory, said client terminal comprising: an account information receiver that receives the transmitted account information; a client side account information memory that stores the received account information; and a client side mail exchange processor that executes processing for mail exchange with said server based on the account information stored in said client side account information memory.