30. A non-transitory computer-readable medium storing a program for causing a computer to realize series information-ready text display, for scroll-displaying text information on a text display screen in synchronism with reproduction of series information correlated to the text information, said computer program comprising: calculating a scroll speed of a target text on the basis of at least a time length of a series information section presently under reproduction, a quantity of the target text belonging to a target text section corresponding to the series information section during reproduction, and text display setting information; scroll-displaying the target text belonging to the target text section at a display reference position of the text display screen according to the scroll speed; and a user instruction input means for dynamically changing the text display setting information related to the display reference position of the text display screen and the scroll method comprising a method for starting a scroll after a lapse of a predetermined time from a starting time of the target text, wherein text of a preceding text section which precedes the target text section and text of a succeeding text section which succeeds the target text section are respectively displayed in two adjacent areas across the target text section displayed at the display reference position of the text display screen, wherein said calculating calculates said scroll speed of the target text on the basis of the display reference position changed by the user instruction input means.
30. A non-transitory computer-readable medium storing a program for causing a computer to realize series information-ready text display, for scroll-displaying text information on a text display screen in synchronism with reproduction of series information correlated to the text information, said computer program comprising: calculating a scroll speed of a target text on the basis of at least a time length of a series information section presently under reproduction, a quantity of the target text belonging to a target text section corresponding to the series information section during reproduction, and text display setting information; scroll-displaying the target text belonging to the target text section at a display reference position of the text display screen according to the scroll speed; and a user instruction input means for dynamically changing the text display setting information related to the display reference position of the text display screen and the scroll method comprising a method for starting a scroll after a lapse of a predetermined time from a starting time of the target text, wherein text of a preceding text section which precedes the target text section and text of a succeeding text section which succeeds the target text section are respectively displayed in two adjacent areas across the target text section displayed at the display reference position of the text display screen, wherein said calculating calculates said scroll speed of the target text on the basis of the display reference position changed by the user instruction input means. 31. The non-transitory computer-readable medium according to claim 30 , wherein in response to there being a section that any text is not presented between the target text section and the preceding or succeeding text section, the target text section includes the section in question.