Determination is made whether or not a cross point coordinate of a zoom value and a degree of luminance belongs to the continuous imaging area of a two-dimensional coordinate plane. When the cross point coordinate is in a single imaging area, since the provability of shake occurrence is low, a first imaging processing is operated. In contrast, when the cross point coordinate is in the continuous imaging area, a shake correction flag representing the execution of the shake correction is set. A multiplane addition composition imaging is not performed uselessly under an imaging condition where the provability of shake occurrence is low. As a result, since the multiplane addition composition imaging is not performed without inevitability, it is possible to avoid a disadvantage that a useless addition processing is executed to thereby generate noise in a shot image stored in an image memory medium.