| In order to be sustainable at the era of globalization, companies taking merger or acquisition as a strategic management. However, blending two or more companies into one is not an easy work, particularly since it includes building new corporate culture, synergizing east and western of multinational corporation culture or even among regional as well as local corporations. This action encourages communication strategic management in building and penetrating new corporate culture. The paper is scrutinized from the perspective of organizational communication theories on corporate culture, communication climate, uncertainty management, cross cultural communication and leadership. Data of the case studies in this paper are collected from empirical observation at three companies in Indonesia then analyzed with the support of literature review. Result shows that there is a significant role of internal organizational communication in the case of merger and acquisition in order to develop and penetrate new corporate culture, and also to reduce uncertainty for organization sustainability in facing globalization. It needs strong leadership, cross cultural communication competence and facilitating open communication climate regarding the complexity in managing human resources as one of the organization important assets. Therefore, in blending cultural differences some aspects of local wisdom should be considered. Some local wisdom that occurs in these studies are the value of ‘Anggarda Paramita’ means ‘to achieve perfection’ acculturated in PT. H.M. Sampoerna Tbk.; leadership philosophy ‘Ing Nagrso sung Tuladha, Ing Madya Mangun Karso, Tut Wuri Handayani’ means ‘leader by modeling and path finding, team builder as aligning, and empowering by leading from behind’ implemented in Bank Mandiri; and ‘Bersatu kita teguh, bercerai kita runtuh’ means ‘we are stronger as a team’ implemented in PT. Intraco Penta. Conclusion drawn from this study is that there is unique approach should be used in designing and implementing strategic communication management in the case of merger and acquisition in responding globalization era. The uniqueness of the approach is especially on the consideration of local wisdom in blending cultural differences. |