South Korea's finance minister Tuesday called on European companies to expand investment here, promising that the government will continue to provide support and help them do business "with security."    Finance Minister Hyun Oh-seok made the remarks during a meeting with envoys of EU member countries in central Seoul. The meeting comes a week after Hyun met with foreign business leaders and urged them to increase local investment and employment. "The Korean government has continued to push forward its efforts to attract foreign investment. We have steadily lowered entry barriers for foreign investors and provided diverse incentives such as tax exemption and financial support," Hyun said in a prepared speech.