In the conventional technology, the PC camera can operate only when it is connected to the PC, and it only has a function for transmitting a photographed image to the PC. The resin catalyst as recovered after it is used for the reaction may be preserved under any of the following conditions: 1) at a low temperature of not higher than 40 C. The semiconductor layer is disposed on the substrate, and a first type carrier is the main carrier in the semiconductor layer. In doing so, the user is guided to pursue development of the potential customer and creates an ongoing written or recorded history by which retrospective evaluation can occur. This process includes neutralizing acidic impurities in an organic isocyanate, partially carbodiimidizing isocyanate groups of the neutralized organic isocyanate, and terminating the carbodiimidization reaction.