8. 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; 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 erases at least an entry word displayed at a most forward position in the entry word candidate display area, and displays a new entry word subsequent to an entry word displayed at a most rearward position in the entry word candidate display area; and (b) when the input coordinate set from the coordinate set input means represents the first sub area, the second display control means erases at least an entry word displayed at the most rearward position in the entry word candidate display area, and displays a new entry word preceding an entry word displayed at the most forward position in the entry word candidate display area.
8. 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; 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 erases at least an entry word displayed at a most forward position in the entry word candidate display area, and displays a new entry word subsequent to an entry word displayed at a most rearward position in the entry word candidate display area; and (b) when the input coordinate set from the coordinate set input means represents the first sub area, the second display control means erases at least an entry word displayed at the most rearward position in the entry word candidate display area, and displays a new entry word preceding an entry word displayed at the most forward position in the entry word candidate display area. 9. A computer readable storage medium according to claim 8 , wherein: when the slide operation is performed by the predetermined distance or longer in the entry word candidate display area, the entry word change operation detection means detects the slide operation as the entry word change operation by the user; and the second display control means does not execute entry word change processing depending on 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, while the user keeps the coordinate set input instruction after the slide operation by the predetermined distance or longer is detected by the entry word change operation detection means.