An electronic apparatus having a RF tag communication function is provided which includes a RF tag reader/writer and a main controller for controlling the RF tag reader/writer. The RF tag reader/writer includes a radio communication section for executing radio communication with a RF tag and a controller for controlling the radio communication section. The main controller is capable of communication with the controller. A command which requests a reply is transmitted from the main controller to the RF tag reader/writer, and the controller is diagnosed based on the reply from the RF tag reader/writer.