| 摘要 |
An image forming apparatus connected to a host apparatus includes a first memory; a second memory; a USB interface to receive a USB control signal or a USB data signal from the host apparatus; a first CPU to perform an operation using the first memory in a normal mode and being deactivated if the normal mode is converted into a power saving mode; and a second CPU to perform an operation using the second memory in the power saving mode. In the image forming apparatus, if the USB data signal is input in the power saving mode, the second CPU activates the first CPU to convert the power saving mode into the normal mode, and if the USB control signal is input in the power saving mode, the second CPU retains the power saving mode and performs an operation corresponding to the USB control signal using the second memory.
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