Internet service server system, computer system and advertising method thereof

PURPOSE: An Internet service server, a computer system, and an advertising method thereof are provided to naturally and comfortably expose a customer to an advertisement when the customer receives a predetermined service from an Internet service server. CONSTITUTION: A customer database(20) stores a member's ID, password, e-mail address, calling contents information, and address book having telephone number which are often used. An Internet telephones service database(21) stores data necessary to provide an Internet telephone service. A banner advertisement database(22) stores a banner advertisement. A moving picture advertisement database(23) stores a moving picture advertisement. A web page database(24) stores a web page to be transmitted to customer computer systems. A second client program is performed by the customer computer systems and requests a moving picture advertisement. A first client program requests a moving picture advertisement from a moving picture advertisement server(29). An Internet telephone server(27) converts a voice signal into a voice packet in order to provide an Internet telephone service. A banner advertisement server(28) extracts a banner advertisement requested by the second client program from the banner advertisement database(22). A moving picture advertisement server(29) receives a request of a moving picture advertisement from the first client program.