This invention is directed to easily set the image sensing conditions of an image sensing apparatus. The image sensing apparatus includes a first control means for controlling to change the image sensing conditions, an image sensing means to sense an image sensing target at every first time interval, and to calculate the evaluation value of the sensed image, and a second control means for controlling to change the image sensing conditions within the range where the evaluation value obtained by the first control means changes from increase to decrease, the image sensing means to sense the image sensing target at every second time interval smaller than the first time interval, and to calculate the evaluation value of the sensed image.