Patent ID: 7937082
Filing Date: 2011-05-03
Classification: H04M

Abstract:
1. A mobile communication terminal communicating with a mobile communication system, the mobile communication terminal comprising: base station transmission information reception means for receiving information transmitted from a base station of the mobile communication system; roaming area detection means for detecting whether or not the mobile communication terminal is located in a roaming area based on the information received by the base station transmission information reception means; communication charge information acquisition means for acquiring 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 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 whether it is necessary to update the communication charge information stored in the communication charge information storage means; updated information reception means for receiving 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; update means for updating the communication charge information stored in the communication charge information storage means based on the updated information received by the updated information reception means; communication charge information read means for reading the communication charge information of the roaming area in which the mobile communication terminal is located from the communication charge information storage means based on information received by the base station transmission information reception means when the roaming area detection means has detected that the mobile communication terminal is located in the roaming area; and communication charge information notification means for notifying a user of the communication charge information acquired by the communication charge information read means; wherein the communication charge information includes version information identifying whether the communication charge information is the latest information, and the communication charge information storage means having version information storage means in a part of the communication charge information storage means; the update necessity inquiry means having version information transmission means for transmitting the version information stored in the version information storage means to a side of the mobile communication system, and further comprising: update-unnecessary information reception means for receiving information 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 information in response to the version information transmitted by the version information transmission means.