A method for trembling compensation of a portable terminal includes obtaining a first image having lower brightness and a second image having higher brightness, the lower and higher brightness being different, by adjusting an iris when an image photograph event occurs, computing motion vectors at respective regions of the first and second images and generating search matrices of the respective regions of the first and second images, searching locations having a similar saturation in the search matrices of the first and second images, and compensating saturation and brightness of the first image having a lower brightness, using the searched locations