According to one embodiment, an IC card includes a first transmission processing section, creation section, second transmission processing section, third reception processing section, and third transmission processing section. The first transmission processing section transmits a first response including the request data. The creation section creates a detailed redundancy check code including a redundancy check code of each of divided blocks. The second transmission processing section transmits the detailed redundancy check code. The third reception processing section receives a third command to request an erroneous divided block. The third transmission processing section transmits a third response including a divided block corresponding to the erroneous divided block.