An apparatus for assisting handicapped people in opening doors. The encoded data is transmitted so as to superimpose, if an empty portion exists in each of the blocks, a part or all of an identifier for identifying a provider of the digital content data onto the empty portion. The memory cells each include a capacitance element, including the first conductor film and second region, an element for reading data, including the first conductor film and first regions, and a selection field effect transistor, including the second conductor film and first regions. The chair back also includes a pelvic support pad which is disposed vertically adjacent to the lumbar support. The process provided reduces the problems associated with ion exchange material fouling and increases contaminant removal capacity.