Polite expression used to introduce information the listener is expected to already know. Often used in formal speech or writing.
See also: ご承知の通り (ごしょうちのとおり)
ご承知のように、来月から新しい制度が始まります。
As you know, the new system will start next month.
ご承知のように、当社は環境保護
As you are aware, our company is committed to environmental protection.