Abstract: In a system where a plurality of electronic devices are connected via digital audio transmission lines based on the S/PDIF standard or the like, quick and easy update of software is made possible even if the electronic devices are not provided with a broadcast reception function, a network connection function and the like. A TV (1) is connected to an AV amplifier (2) via an S/PDIF line (3). The TV (1) is provided with: a tuner (11) that acquires update data used for updating software in the AV amplifier (2); and a S/PDIF terminal (19) that transmits the thus acquired update data to the AV amplifier (2) via the S/PDIF line (3). The AV amplifier (2) is provided with a controller (21) that updates the software in the AV amplifier (2) with the update data transmitted by the TV (1).

Abstract: Updating of software is made to be quick and easy, even for electronic devices that do not have a broadcasting-receiving function or a network-connecting function, in a system in which multiple electronic devices are connected via a communication interface such as HDMI. A software updating system has a recorder (1) and an AV amplifier (2) connected via an HDMI. The recorder (1) is provided with a tuner (11) that obtains update data for updating the software of the AV amplifier (2), and an HDMI transmission unit (19) that transmits the obtained update data to the AV amplifier (2), via an audio transmission line of the HDMI standard. The AV amplifier (2) is provided with a controller (21) that updates the software of the AV amplifier (2) with the update data transmitted from the recorder (1).