1. An image sensing apparatus that senses objects and processes image signals obtained from such image sensing, comprising: a face detection unit adapted to detect a face area from said image signals and acquiring a degree of reliability indicating a probability that said detected face area shows a face; a first calculation unit adapted to calculate first white balance correction values using image signals deemed white from among said image signals; a second calculation unit adapted to calculate second white balance correction values using image signals of said face area detected by said face detection unit from among said image signals; a third calculation unit adapted to calculate third white balance correction values by weighting and combining said first white balance correction values and said second white balance correction values based on said degree of reliability acquired by said face detection unit; and a white balance correction unit adapted to perform white balance correction using said third white balance correction values.