| 摘要 |
A USB host includes a first connection unit capable of being connected to and disconnected from one end of a USB cable including two power lines and two signal lines, the other end of the USB cable being connected to a USB device; a first output unit that outputs information through the first connection unit; and a first control unit that causes the first output unit to transmit an instruction to request power supply to the USB device through at least one of the two power lines and the two signal lines in the USB cable and, then, causes the first output unit to transmit information to the USB device with power received from the USB device through the USB cable.
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