Information validity refers to“critical point” that decides information creation or effect loss and effect characters (nature and state), that is, the “degree” or “propriety” of information effect. In the related information practices, well recognized and controlled information validity means a good understanding of the nature and state of information effect. Information validity performs complicated and changeable, secret and subtle in reality. In order to obtain a good awareness and properly grasp of information validity, rational thinking is insufficient, yet wisdom is most needed. In addition, information validity is broadly divided into individual information validity and group information validity.