An apparatus for setting up exposure time and a method thereof are provided to measure the exposure time to have a neighboring value to a target value according to each region by setting up the target value of a part in a classified region after classifying the region by using image information of the classified region. An apparatus for setting up exposure time comprises the followings: a section set up unit(120) setting up one more luminance section with reference to inputted brightness distribution of an image; a region dividing unit(130) dividing at least two or more images; a region classifying unit(140) classifying each region to the luminance section; and an exposure time set up unit(160) setting up the exposure time.
