The 'Whose Time Is Now' video features Leona Lewis, One Direction, Olly Murs, Alexandra Burke, JLS and Little Mix talking about their X Factor experiences.
Watch the new X Factor trailer below:
Acts including Ward and other series winners Matt Cardle, Joe McElderry, Leon Jackson and Steve Brookstein are not mentioned in the promo.
Commenting on the video on Twitter, Ward said: "Just seen the new X Factor promo video. Yet again it's like I'm being erased slowly from their history.
"Pathetic really. Would love to know why?"
Ward scored two platinum albums after winning the 2005 series of X Factor, however, his third record Obsession only reached number 15 in 2010 and the single of the same name charted at 97.
Meanwhile, Digital Spy readers have complained that the promo made it look like One Direction had won their series of the show, while actual victor Matt Cardle didn't even feature.
Also, Joe McElderry left a cryptic message on Twitter that many fans believed related to the video, writing: "I'm just gonna keep doing my thing :D #thatisall #loveforthemassive."
The ninth series of The X Factor will start next month on ITV1.