When conditions for copying are satisfied while an image sensing apparatus is connected to a PC, copying is executed by only operating the copy button of the image sensing apparatus, and the progress of copying operation can be notified on the image sensing apparatus side. For this purpose, a program monitoring whether a digital video camera is connected is resident in a memory of the PC. When the digital video camera is connected to the PC, it is determined whether a writable optical disk is set, i.e., whether conditions for copying are satisfied. If the PC is ready for copying operation, the program notifies it to the digital video camera. Upon reception of this, the digital video camera turns on a copy button incorporating an LED. When this button is pressed, corresponding information is notified as response data to the PC, thereby starting copying operation.