A communications network system which is capable of continuously performing a normal communications of data on a communication cable. According to the invention the following steps are performed: Determining link resource status. Next, providing a tool handle comprising a distal end, a proximal end and a socket formed at the distal end. The air inlet amount and the air outlet amount of the second fan unit are increased by the side air inlet. In this virtual library it is possible to search billions of possible product compounds in relatively short time frames. With this arrangement, the frequency of replacement of the black toner cartridge can be reduced without adversely affecting the size of an apparatus main body.