“Is English or Mandarin the language of the future” is a title in BBC news on February 22nd , 2012. A author, Pak, explains that how Southeast Asia people study English and mandarin for their business perspectives such as in Singapore, Malaysia According to the Association of Southeast Asian Nations are going to be ASEAN Economic Community(AEC) in 2015, “achieve greater flexibility in language” is stated in a road map of ASEAN community document (ASEAN,2009). It means they can use any language for communicating among ASEAN people . In another hand, the most important language should be English because the most information which available at the ASEAN website and its publication use English language. In addition, it shows in the Wikipedia that the working language of ASEAN is English(2012). The next languages should be Bahasa Indonesia and Thai language, relatively (Kaewmala, 2012).