An object class andor an object having a given name is derived by making a copy, preferably through serialization, of the entire tree of the class or the object, by storing the copy of the tree on a disk D and by assigning a name to the stored copy. Thus, even if an electronic device connected to a network system does not have a function for obtaining time information through the network system, time corresponding to time information can be set for the electronic device. The biasing device is disposed at a front end such that when the pull button is at an unlocked position, a gap is formed between a rear end of the pull button and the bottom side of the concave pivotal portion; when the pull button is at a locked position, a front end of the pull button is adapted to engage the first engaging device. The second up-converted photonic signal has a third frequency 312.