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The interface design concept of especially mobile products has been getting more significant according as the multifunctions and access to the internet these days. The purpose of this work is to reconsider the interface design concept with referring to developing products we have experienced. In the first half of this paper, thoughts of usual interface design have been examined and considered from a view of four axes we provided. It is found that the interface design has the principle aimed at taking the shortest course to a function for easiness to recognized and understand. New interface design concept without not only clear purpose but also the shortest way appearing on the stage has been considered and proposed in the latter half.