Obama administration has lost for the mid-election in 72 years of history due to its failure to accomplish certain outcomes regarding financial crisis and foreign policy such as Iranian and North Korean nuclear issues. President Obama came to power with advocating changes, but now he has faced the demand to be changed. As Obama would not easily solve the domestic problems, he is likely to make change through the foreign policy. In order to diagnose the change of Obama's foreign policy, I'd like to note his foreign policy trend in microscopic term and the change of global and regional structural system in macroscopic term. First,President Obama represented himself equivocal regarding the foreign policy trend as he showed constant ambiguity of his ideological movement. His ideology and strategy is likely to be changed depending on the global and regional situation. Obama approached the Nuclear issues differently while trying to solve it through cooperation. First, regarding Iranian nuclear issue,Obama has recognized several suggestions to solve the problems with the military force. Generally, measures taken by U.S. military force are suggested as low possibility, but there is a possibility for Israel to conduct armed force attack. Israeli armed force attack would probably receive "silent-agreement" from the U.S. In contrast, Obama administration is likely to use a measure of "manage first and treat afterward" regarding North Korean nuclear issue. If they consider military measures, it will be possible after the end of wars in the Middle East. However, recent provocations by North Korea have turned out to be a new variant. If North Korea keeps provocating, the ROK-U.S.' punitive and retaliatory military measures may lead to the way of solving North Korean nuclear issue.