In a digital still camera equipped with a DAP (Digital Audio Player), the camera is so adapted that the camera can be used in a camera mode even when battery voltage declines owing to use of the camera in the DAP mode. The number of images to be recorded in the camera mode is set and so is a warning voltage necessary to record images of the set number. If battery capacity declines owing to operation in the DAP mode and the battery voltage reaches the set warning voltage, the user is notified of the fact that if use in the DAP mode is continued, it will not be possible to record the set number of images. By ceasing to use the camera in the DAP mode, a further decline in the capacity of the battery can be prevented. This makes it possible to reserve enough battery capacity to carry out the recording of the set number of images.