Patent ID: 8478248

Claim:
A bidirectional information sharing system using a wireless data network, the system comprising: a mobile phone of a first user that transmits first sharing information to a mobile phone of a second user at the time of call connection to the mobile phone of the second user and receives second sharing information transmitted from the mobile phone of the second user and outputs the received second sharing information on a screen; and a mobile phone of a second user that transmits the second sharing information to the mobile phone of the first user at the time of call connection to the mobile phone of the first user and receives the first sharing information transmitted from the mobile phone of the first user and outputs the received first sharing information on a screen, wherein the first and second sharing information is set by the first user or the second user, and wherein the mobile phones of the first and second users are configured to determine whether there is the first or second sharing information, to determine whether there is advertisement information pre-stored by the users if it is determined that there is no first or second sharing information, and to output the advertisement information on the screen if it is determined that there is the advertisement information.