According to one embodiment, an IC card includes a communication unit, a controller, a data storage unit, a command processor, and a response unit. The controller performs data communication of the communication unit by using a logical channel. The command processor performs access to data specified by a command on a logical channel specified by the command. The response unit outputs a response message in response to the command, with the response message added with information indicating that the specified data is inaccessible because the data is used on an other logical channel, if the data specified by the command is inaccessible because the data is used on a channel other than the logical channel of the command.