10. The captioned image reproducing device according to claim 6 , further comprising: an image creating unit that creates a picture image indicating the length of a total reproduction time of a content stored in the memory unit; an image synthesizing unit that synthesizes a predetermined first image with the picture image at a position corresponding to the reproduction start information of the caption text to which an identifier indicating that the caption text is the received caption is added, and synthesizes a predetermined second image with the picture image at a position corresponding to the reproduction start information of the caption text to which an identifier indicating that the caption text is the dummy caption is added; and a display unit that displays a synthesized image synthesized by the image synthesizing unit.
14. The captioned image reproducing device according to claim 10 , wherein: the first image is a circle having a predetermined diameter; and the second image is a circle having a diameter different from the predetermined diameter.