Patent ID: 8489091
Filing Date: 2013-07-16
Classification: H04M

Abstract:
1. An IC card removable from a mobile communication terminal and capable of communicating with the mobile communication terminal in which the IC card is installed, the IC card comprising: roaming area detection means for detecting whether or not the mobile communication terminal is located in a roaming area based on information received by the mobile communication terminal, in which the IC card is installed, from a base station; communication charge information display request means for requesting the mobile communication terminal to display communication charge information of the roaming area in which the mobile communication terminal is located when the roaming area detection means has detected that the mobile communication terminal is located in the roaming area; communication charge information acquisition means for acquiring the communication charge information of the roaming area from a mobile communication system through the mobile communication terminal in which the IC card is installed; communication charge information storage means for storing the communication charge information of the roaming area acquired by the communication charge information acquisition means; update necessity inquiry means for inquiring of the mobile communication system through the mobile communication terminal whether it is necessary to update the communication charge information stored in the communication charge information storage means; update means for updating the communication charge information stored in the communication charge information storage means based on an updated information transmitted from the mobile communication system when the mobile communication system has determined that it is necessary to update the communication charge information in response to the inquiry from the update necessity inquiry means; and update-unnecessary information reception means for receiving information through the mobile communication terminal that the communication charge information is not a necessary update transmitted from the mobile communication system when the mobile communication system has determined that the communication charge information stored in the communication charge information storage means is the latest communication charge information, wherein: when the roaming area detection means has detected that the mobile communication terminal is located in the roaming area, the communication charge information display request means transmits the communication charge information updated by the update means or the latest communication charge information to the mobile communication terminal and requests the mobile communication terminal to display the communication charge information; the communication charge information includes version information identifying whether the communication charge information is the latest information, and the communication charge information storage means has version information storage means in a part of the communication charge information storage means; and the update necessity inquiry means includes version information transmission means for transmitting the version information stored in the version information storage means to a side of the mobile communication system through the mobile communication terminal.