1. A conference system, comprising: a recognition section for recognizing speech in a first language; a translation section for translating a recognition result recognized by the recognition section into a second language different from the first language; a generation section for generating a translation subtitle for displaying a translation result translated by the translation section and the recognition result corresponding to the translation result in parallel, and a recognition result subtitle for displaying the recognition result that has not been translated by the translation section; and a display section for displaying the translation subtitle and the recognition result subtitle generated by the generation section, wherein the recognition section recognizes the speech in the first language at least twice, the conference system further comprising: a recognition determination section for determining whether or not a recognition result obtained in the first recognition by the recognition section should be replaced with a recognition result obtained in the second or later recognition; and an area determination section for determining, when it is determined by the recognition determination section that the recognition result obtained in the first recognition should be replaced, whether or not a displayable area capable of displaying a replace portion of the recognition result obtained in the second or later recognition is generated in the translation subtitle by erasing a replaced portion of the recognition result obtained in the first recognition in the translation subtitle displayed in the display section, wherein the generation section corrects, when it is determined by the recognition determination section that the recognition result obtained in the first recognition should be replaced, the translation subtitle to a translation subtitle in which the recognition result obtained in the second or later recognition and a translation result translated from the recognition result obtained in the second or later recognition by the translation section are displayed, wherein the display section includes: an erase section for erasing the replaced portion when it is determined by the recognition determination section that the recognition result obtained in the first recognition should be replaced; a scroll display section for scrolling, when it is determined by the area determination section that a displayable area is not generated, a portion of the translation subtitle following the replaced portion in a direction toward an end for providing the displayable area; and a replace portion display section for displaying the replace portion in the displayable area.
4. The conference system according to claim 1 , wherein the display section displays the replace portion emphatically as compared with the other portion of the translation subtitle for prescribed time in displaying the replace portion in the displayable area.