12. A computer readable storage medium according to claim 7 , wherein: the entry word data includes the plurality of entry words which are sequentially ordered from a first entry word to a final entry word; the first display control means assigns the entry words included in the entry word data to virtual book pages, displays an entry word assigned to an N'th page (where N is an integer equal to or greater than 3) in a first sub area of the entry word candidate display area, and displays an entry word assigned to an (N+1) 'th page in a second sub area of the entry word candidate display area; when the long push operation is performed for the predetermined time period or longer in the entry word candidate display area, the entry word change operation detection means detects which of the first sub area and the second sub area of the entry word candidate display area is represented by the input coordinate set from the coordinate set input means; and (a) when the input coordinate set from the coordinate set input means represents the second sub area, the second display control means replaces the entry word displayed in the first sub area with an entry word assigned to an (N+2) 'th page and replaces the entry word displayed in the second sub area with an entry word assigned to an (N+3) 'th page; and (b) when the input coordinate set from the coordinate set input means represents the first sub area, the second display control means replaces the entry word displayed in the first sub area with an entry word assigned to an (N−2) 'th page and replaces the entry word displayed in the second sub area with an entry word assigned to an (N−1)'th page.
7. A computer readable storage medium according to claim 1 , wherein when the long push operation is performed for a predetermined time period or longer in the entry word candidate display area, the entry word change operation detection means detects the long push operation as the entry word change operation by the user.