Abstract: A matching system includes at least one object matching apparatus and a search matching apparatus. Each object matching apparatus includes first antennas for emitting at least one radio frequency signal. The search matching apparatus includes a distance determination module having second antennas for receiving the radio frequency signal, and calculating a relative distance information and a relative direction information corresponding to each object matching apparatus according to a signal strength value of the radio frequency signal; a direction determination module for calculating an absolute direction information of the search matching apparatus corresponding to the earth coordinate system; and a calculating module for receiving the relative distance information, the relative direction information and the absolute direction information on the earth coordinate system to calculate an relative position corresponding to each object matching apparatus.

Abstract: A method of adjusting clock speed of a central processing unit (CPU) of an electronic appliance including the following steps: (a) generating a first system loading of the CPU according to an active time of a first time period; and (b) determining the clock speed of the CPU according to the first system loading.