For the construction of effective knowledge base on safety and non-anxiety for nuclear power, a study on new communication system about social risk information has been initiated by noticing the rapid expansion of Internet in the society. By constructing Internet Website communication system on the geological disposal of high-level radioactive wastes, we conducted the experiment of communication for verifying the principles such as that the basic technical knowledge and trust, and social ethics are indispensable in this process to close the perception gap between nuclear specialists and the general public. The cognition structural equation model by means of the variables reduction method of multiple regression analysis and by compiling the significant paths by covariance structure analysis was built based on this experimental data. Moreover, by investigating more detailed public subconscious on the high-level radioactive wastes by ¡Ètext mining method¡É with the special reference to the Public Comment in July 2000 and the literature survey, it was found that the freely discussing ideas based on the environmental ethics such as ¡Èfairness in results¡É and ¡Èfairness in opportunity¡É from scratch would gain a potential of enhancing the social receptivity.