In this paper, I describe the necessity of confirming original information in "Database of Historical Sino-Japanese Readings." Confirmation of the original image is necessary for both the database creator and the user. The original information may be confirmed by a copy or a public image. However, the database creator may need to see the original document itself. For the reasons stated in this paper, databases of historical language materials should be constructed so that the relevant parts of original images or reprints can be easily identified. In order to confirm the original information of the database concerning the kanji, the information of the character and the place is necessary. The databases of old dictionaries, words of Chinese origin, Buddhist scriptures, and Chinese books can be connected by using these characters and the places where they appear as keys. By positioning kanji and kanji sounds in the various aspects of language life at the time and studying them as part of the history of language life, research on kanji and kanji sounds will make great progress with a more reliable breadth and multilayered nature.