A computer that is programmed with collaboration software receives a change to be made to an object that can be of any type among several predetermined types such as message, document, contact, discussion and meeting. A cart support is longitudinally fixed to the lateral surface of the bag via upper and lower brackets. An insulating layer is provided on the electrolyte membrane between adjacent cathode catalyst layers. The connection member 32 is widened in an outer direction of the rim of the base frame 30 and is slanted at a certain slope. The selection element includes a first area and a second area allowing selection between the excitation and fluorescent light.