Patent ID: 7522879

Claim:
A communication apparatus providing data transmission by electromagnetic waves to an external apparatus and data transfer by load modulation with respect to electromagnetic waves transmitted from the external apparatus, the communication apparatus comprising: an antenna; a receiving and demodulating unit configured to detect current flowing in the antenna and to demodulate a reception signal received from the external apparatus; a modulating and transmitting unit configured to modulate a carrier in accordance with a transmission signal to be transmitted to the external apparatus and configured to transmit the modulated carrier via the antenna; a transmission and reception control unit configured to control reception of the reception signal by the receiving and demodulating unit and transmission of the transmission signal by the modulating and transmitting unit; a storage unit configured to store data; and an operation control unit configured to control an operation at the apparatus, the operation control unit including a hand control configured to select the communication apparatus to a transmission state and an acquisition state, the operation control unit transmits data stored in the storage unit or acquires data sent from the external apparatus to the storage unit in accordance with a communication state set at either the transmission state or the acquisition state when the communication apparatus is within a communication range of the external apparatus; wherein the state setting part includes a motion detector configured to detect motion of the communication apparatus, and when the communication apparatus is moved in a first direction after the communication apparatus becomes capable of communicating with the external apparatus, the communication apparatus is set to the transmission state to transmit the data stored in the storage unit, and when the communication apparatus is moved in a second direction, which is opposite to the first direction, after the communication apparatus becomes capable of communicating with the external apparatus, the communication apparatus is set to the acquisition state to acquire the data transmitted from the external apparatus and to store the acquired data in the storage unit.