In a firmware update apparatus, a reference device specification part specifies one of a plurality of audio processing devices as a reference device. A version number acquisition part acquires version numbers of firmwares stored in the audio processing devices. A matching table storage stores a matching table defining a combination of compatible version numbers of firmwares. An incompatible device display part performs display for specifying an audio processing device that stores a firmware that does not satisfy compatibility defined in the matching table with a firmware stored in the reference device. An update target type selection part specifies a firmware update target device type from among a plurality of device types. A firmware update instruction part transmits an update command instructing update of the firmware to one or more of audio processing devices belonging to the firmware update target device type selected by the update target type selection part.