An information processing system including an IC chip, a client driving the IC chip to carry out predetermined processing, a server connected to the client by a communication network, wherein the client has a processing-command requesting section configured to request for transmission of a processing command to the server; an ID-acquisition-command sender section configured to transmit an ID acquisition command; a chip-ID extraction section configured to extract the chip ID; and a processing-command sender section configured to embed the extracted chip ID into the processing command and transmit the command. The server has a command-group sender section configured to send the command. The IC chip has a chip-ID sender section configured to transmit data; a chip-ID determination section configured to determine whether the chip ID in the command is identical with the chip ID of the IC chip; and a processing execution section configured to carry out the predetermined processing.