Patent ID: 7159770

Claim:
A shop settlement method using a cell phone, having a camera and an IC chip, and a POS register terminal, the method comprising: generating, at said POS register terminal, settlement request information including an amount of settlement upon receipt of an operational input of IC card settlement to said POS register terminal; generating a request barcode from said settlement request information and causing screen display or printing output by said POS register terminal; restoring said settlement request information by imaging said request barcode by the camera of said cell phone; subtracting an amount of settlement of the settlement request information restored from a value charged to the IC chip of said cell phone; generating settlement response information including a balance after settlement of said IC chip; causing screen display by said cell phone by generating a response barcode from said settlement response information; restoring said settlement response information by reading out said response barcode of said POS register terminal; and confirming the end of IC card settlement from the restored settlement response information, thereby printing a receipt by said POS register terminal.