Li Wei, an expert with the China Institute for Contemporary International Relations, says the international community has yet to come to agreement on a coherent definition of "terrorism."

"Some countries only consider their own interests in the global anti-terrorism campaign. Thus, problems such as hegemony, eradicating dissident countries under the name of anti-terrorism have emerged. These problems actually create a larger space in which international terrorists can exist and develop."

Li Wei also admits it's hard for countries with different interests to achieve a common understanding on this point.

In addition, according to the expert, not being able to find an efficient way to really crack down on terrorism is another headache. He says the US launching a war on Iraq, without United Nations' approval is just an example.

Li Wei says the US has not only paid a heavy price for the war itself, but has also helped to strengthen the power of terrorist groups.

"The war in Iraq provides a new stage for international terrorist groups to publicize themselves, to recruit and train more terrorists. Iraq has appealed to many extreme terrorists throughout the world. It is also a source of terrorists who then travel to other countries."

Li Wei adds that some improper measures such as prisoner abuse also aggravate the opposition among various religious cultures.