An image sensing apparatus includes an image capture unit, a communication unit and a switch. The image capture unit captures a digital image using an image sensing device. The communication unit transmits a resume signal to an external computer, the resume signal being used by the external computer to release a suspended state. The switch enables the image sensing apparatus to capture a digital image using the image capture unit and enables the image sensing apparatus to transmit the resume signal to the external computer using the communication unit. Before the resume signal is transmitted to the external computer, the image sensing apparatus determines whether the external computer is in the suspended state. If it is determined that the external computer is in the suspended state, the image sensing apparatus enables the communication unit to transmit the resume signal to the external computer so as to release the suspended state.