An image sensing apparatus comprises an image sensing unit adapted to sense an object; a signal processing unit adapted to convert an image signal outputted from the image sensing unit into digital image; a communication unit adapted to transmit a resume signal to a computer connected to the image sensing apparatus; and a switch for indicating the image sensing apparatus to transmit the resume signal to the computer. Before the resume signal is transmitted to the computer, the image sensing apparatus determines whether the computer is in a suspended state or not. If it is determined that the computer is in the suspended state, the image sensing apparatus transmits the resume signal tothe computer to release the suspended state.