In recent years, user interface aimed at easiness to use with pleasure in portable information products becomes more significant for makers. New interface design with guidance concept has been proposed in this paper. In the first half of this paper, after finding fact and the comparison with current products regarding user interface, idea sketches have been developed. The guidance concept is explained that the procedure of operating by use of keys corresponding to contents of the display (LCD) right above them is taught to a user to reach one's purpose without dependence on one's memory and also the shape of these keys conformed to image of menu list looped in the display makes a user more easily understand how to use them in the latter half. It has been verified and found that the guidance concept is much effective and improves it well by usability evaluation test.
