To enable a progressive synthesization process suited to each video signal even in such a case that a difference between video signals based on a video transmission sequence and the video signals not based on the video transmission sequence, is fuzzy. A converting device according to the present invention detects as to whether a result of evaluation about whether or not inputted interlaced video signals are video signals based on a video transmission sequence meets a first standard and a second standard or not, converts the interlaced video signals into progressive video signals on the basis of the video transmission sequence when detecting that the interlaced signals meet the first standard, converts the interlaced video signals into the progressive video signals on a pixel selective basis when detecting that the interlaced signals do not meet the first standard but meet the second standard, and converts the interlaced signals into the progressive video signals on a pixel interpolative basis when the interlaced signals meet neither the first standard nor the second standard.