Image forming apparatus, power supply apparatus, and method of supplying power

摘要

When it is detected that an external device has been connected, the printing unit is controlled so as to form an image according to image data that has been received from the external device. As a result, image forming can be started earlier compared with the case in which image forming is prepared after the image data is transmitted. Accordingly, the user waits a shorter period of time and the usability is improved.