There is provided a method of providing customized advertisement/news in a scalable application service system. The method of providing customized advertisement/news for a scalable application service server includes: substituting an advertisement/news component of existing content with a Scalable Application Description Language (SADL) component to create SADL integrated document; receiving an application request requesting transmission of the existing content, the application request including delivery context about a terminal; applying the delivery content about the terminal to parse the SADL integrated document, thereby creating customized content including customized advertisement/news; and transmitting an application response including the customized content to the terminal.