Abstract: A method for providing a social activity integration service run on a social activity integration service providing server comprises designating and inserting a unique key and an embeddable commenting program, into a web content of a website, inserting the unique key into an app content corresponding to the web content where the unique key is designated and to be uploaded to an appsite or an application, crawling the appsite and the application using an app crawler to extract an app content having the same key as the unique key of the website, inserting comment data of the extracted app content to be integrated with comment data of the web content of the website, and integrating the comment data of the app content and the comment data of the web content into the comment data of the web content and displaying the integrated data.