Actually I realized that the map includes chinese character which is used in both Japan and Korea and it is hard for foreigners to understand chinese character. The chinese character(ìíÜâú) marked in the map of East sea means Japanese sea. East sea's chinese character name is ÔÔú, which just means east sea.
Again, I deeply thank you for your reply which had given me a lot of positive energy.
Yours faithfully, ±èÇØÁ¤.