2009-146085 is referenced by 3 patents.
PROBLEM TO BE SOLVED: To improve read/write accuracy by promptly enabling communication between a mobile terminal having a built-in contactless IC card, and a reader/writer unit.SOLUTION: In a memory 30, images of each shape of various types of the reader/writer units and a reading mark (logo), and an optimal frequency for each reader/writer unit are stored in advance in association with each other. A frequency control application 20 compares and collates the image of the reader/writer unit 2 obtained by a camera module 40, with each image of the reader/writer unit stored in advance in the memory 30. When an identification result shows matching (identification in success), the optimal frequency stored in the memory 30 in association with the identified reader/writer unit, is selected and set to a tuning circuit 101. Instability of communication between the reader/writer unit 2 and a contactless IC card unit 10 is eliminated, and stable communication can be obtained promptly.