Taiwan's Uni-President Enterprise Corp. started its business from flour. In order to save costs, Uni-President proceeded with a vertical industrial integration at the initial stage, opened additional businesses at the middle stage, and diversified until recently. He has been playing a pivotal role as a pioneer for marketing, product development, and even diversification strategies in this industry. With the expansion of overseas investments, Uni-President Enterprise Corp. received significant benefits from economies of scale. South Korea has been a formidable competitor to Taiwan. Our market is not only flooded with various Korean electronic equipment, household appliances and audio-visual entertainment, but also the foods. For example, the koala-shape biscuits and chocopie, which are rather popular, are from Lotte, the food industry leader of South Korea. These two enterprises are both leaders in the food industry, and take integration and diversification as parts of their development process. Diversification of product and business is the main method to facilitate growth. M&A (Merger & Acquisition) is the fastest and safest way to enter a new business field. Taiwan's Uni-President Enterprise Corp. and Korea's Lotte Group are the main cases for this study. Here we analyzed their strategies and motivations to understand the synergy and business performance these groups have as well as their differences.