A disc cartridge of the present invention is provided with a protrusion section on a shutter sliding surface so as to surround at least part of an opening. The agent may respond to a particular context with certain information, either by verbally informing the remote party or causing a prerecorded script to be played to the remote party. The target braking force calculator calculates the first target braking force portion and the second target braking force portion according to the contribution degrees and obtains the final target braking force by adding the first target braking force portion and the second target braking force portion. Such a system can allow a photographer to control a controlled device while remaining at the camera body. First pixel rows of the pixel row pairs include first sub-pixels and second sub-pixels arranged in an alternating manner.