A communication device includes an IC (integrated circuit) chip storing information in a predetermined area and functioning as a reader/writer that reads out or writes information stored in another IC chip. Also, the communication device downloads an agent from an information processing device connected to the network. Here, the agent is provided as application software operating the IC chip as a reader/writer. Furthermore, the communication device downloads a role from the information device connected to the network using the agent downloaded therefrom, where the role is provided as script data in which part of the contents of processing of the reader/writer performed by the agent.