Patent ID: 8570155

Claim:
A mobile terminal device designed to perform wireless communication with an RFID tag being held over the mobile terminal device by using electromagnetic waves, the mobile terminal device comprising: a plurality of antennae arranged in or in vicinity to a display area of the mobile terminal device; and a control unit configured to detect a part of the display area which is not covered with the RFID tag, from electromagnetic wave intensities acquired by the plurality of antennae and to display information for a user in the detected part of the display area which is not covered with the RFID tag, wherein the control unit is further configured to: determine whether or not the RFID tag is held over the mobile terminal device, compare electromagnetic wave intensities acquired by the plurality of antennae when it is determined that the RFID tag is being held over the mobile terminal device, specify the part of the display area which is not covered with the RFID tag, of an entire display area of the mobile terminal device, based on a comparison result, calculate a ratio of the part of the display area which is not covered with the RFID tag to the display area, display the information on a display position in the specified part of the display area which is not covered with the RFID tag when it is determined that the calculated ratio is greater than a predetermined value, and notifies the user by sound, light, or vibration if the calculated ratio is less than or equal to the predetermined value.