Facts are real existence that can be grasped through human beings’ senses and thoughts. In English, the word “fact” derives from the Latin factum, which means something that has already existed. The concept of “fact” is in subordinate relation with that of “existence”. Hence, in Black’s Law Dictionary, fact is defined as “something that actually exists” (Garner, 2004: 628). In philosophy, “existence” is an ontological concept that refers to the objective world, which is independent from human beings’ subjective consciousness. Wittgenstein stated that “the world is independent of my will” (Wittgenstein, 1962: 94). As an epistemological concept, “fact” has three principal characteristics, i.e., authenticity, empiricalness and descriptiveness.