A graphical user interface allows a user to easily input a character via a small-sized display screen without having to use a keyboard, wherein first and second page bars are displayed in a page bar display area, and a first and second display windows are displayed on the first and second page bars, respectively. The positions of the first and second display windows on the first and second page bars are changed in response to an inputting operation performed by a user. Characters displayed in the respective first and second display windows are determined in accordance with the positions of the first and second display windows. Forward retrieval is performed in accordance with the characters displayed, and retrieved data is displayed in an entry display area and a main body display area. By changing the position of a cursor, which is displayed on a page bar when the two characters displayed in the respective display windows are fixed, the user can select a desired word from those which are displayed in the entry display area. The word selected from the words starting with the two fixed characters and a main body corresponding to the selected word are displayed.