MOBILE TERMINAL APPARATUS AND METHOD FOR ADJUSTING RFID ANTENNA RESONANCE FREQUENCY THEREOF

The present invention is designed to avoid an occurrence of a situation in which a resonance frequency of an RFID antenna, optimized at manufacture, is varied to render RFID communication impossible under the influence of extension function installed by option. A portable terminal apparatus equipped with an RFID function, includes a storage unit (407) storing in advance correspondence between an apparatus configuration in which the portable terminal apparatus has a predetermined preset extension function allowed to be added thereto, and a correction value of a resonance frequency of an RFID antenna, a detection unit (407) detecting which extension function is installed on the portable terminal apparatus, and a control unit (404) obtaining a correction value of the resonance frequency of the RFID antenna, corresponding to an apparatus configuration including the extension function, from the storage unit and correcting the resonance frequency of the RFID antenna, based on the correction value.