電通グループ - SERP Analysis

https://www.group.dentsu.com/jp/

https://www.group.dentsu.com/jp/group/

https://ja.wikipedia.org/wiki/%E9%9B%BB%E9%80%9A%E3%82%B0%E3%83%AB%E3%83%BC%E3%83%97

https://www.dentsu.co.jp/aboutus/summary/sub_company/index.html

https://www.dentsu.co.jp/

https://www.nikkei.com/nkd/company/?scode=4324

https://finance.yahoo.co.jp/quote/4324.T

https://www.dentsu.co.jp/aboutus/summary/company.html

https://www.dentsu.co.jp/aboutus/