A USB host is provided which can connect to a USB device via a USB hub, the USB host including, a combination storage unit that stores an upgrade allowable combination, for which upgrading of the USB device is allowed, among a combination of hub identification information for identifying the USB hub and device identification information for identifying the USB device; an identification information acquisition unit acquires hub identification information from the USB hub in compliance with USB standards when the USB hub is connected and acquires device identification information from the USB device in compliance with USB standards when the USB device is in connected to the USB hub; and a command transmission unit that transmits an upgrade command to the USB device when a combination of the acquired hub identification information and the acquired device identification information is identical to the combination stored in the combination storage unit.