In the global market environment, financial companies are expanding their plans to integrate capital market functions such as investment trading, brokerage and corporate finance, etc. These measures are implemented in expectation of operational efficiency or synergy. Korean financial companies are increasingly interested in converging the capital market functions within the company or the its financial group and in mutual cooperation, as well. According to the 「Financial Investment Services and Capital Markets Act」(hereinafter “The Act”) in Korea, it provides strict regulations on the scope of businesses and the types of prohibited acts with respect to conflict of interest. Therefore, integrated operation or information exchange of financial investment functions is prohibited in principle unless it is permitted subject to the exceptional clauses. Also, financial companies cannot easily cope with the appearance of new financial circumstances or the change of financial industry. On the other hand, foreign countries do not specifically specify the scope of business or prohibited activities, instead ensure the autonomy of financial companies. Supervisory institutions are responsible for monitoring the adequacy and operation of the financial company s conflict of interest prevention system. In domestic cases, principle-based regulations are necessary for the integration and efficient operation of capital market functions, considering the individual characteristics of financial companies, scope of business, and the suitability of an internal conflict prevention system. In addition, the Act needs to be modified to support functional integration by way of concurrent offices and allow information exchange to the extent that customer’s right on the financial and personal information is not infringed.