The present invention provides a USB function apparatus which supports a plurality of USB descriptors and which is connected to a host apparatus via a USB to operate as a USB function, the USB function apparatus comprising a descriptor switching device which switches one of the plurality of USB descriptors to be transmitted to the host apparatus, a bus reset generating device which generates a bus reset to initialize communications with the host apparatus, and a control device which, when a descriptor request from the host apparatus is responded with a current USB description but if the host apparatus does not start communications in accordance with the USB descriptor, causes the descriptor switching device to switch the USB descriptor and causes the bus reset generating device to generate a bus reset.