An IC card system includes an IC card, an IC card read/write unit for reading/writing the IC card, a communication unit intervening for connection to a communication line network, a controller for controlling the IC card read/write unit and communication unit, and a server system connected to the communication line network. The IC card is written with at least specified access destination information for accessing the server system, the controller automatically accesses the server system through the communication unit in accordance with the access destination information in the IC card, and the server system offers information to an information offering destination determined automatically by information to be offered which is processed by the server system, an information offering destination already written in the IC card inserted in the IC card read/write unit or an information offering destination designated by a user after the insertion of the IC card.