In a digital camera 1, when the shutter button is half-depressed (Y at S2), face detection processing is performed on periodically imaged frame images until it is fully depressed (N at S6), and face detection results are cyclically stored in a detection result storage area. When it is fully depressed (Y at S6), a still-image imaging operation is performed, and the face detection processing is performed on an imaged still-image (S7 and S8). Then, after a high priority face detection result is selected from among the face detection results currently stored in the detection result storing area (S9), the selected face detection result and the face detection result of the still-image are compared and judged whether or not they are in agreement (S10 and S11). When judged not to be in agreement, the still-image is displayed as a preview and the warning display of this disagreement is performed (S13).