In performing an AF operation in a lens-exchangeable camera, whether or not the DVP reference for a lens mounted (i.e., a position serving as a reference for forward movement of the lens) is infinity, is determined. When the DVP reference is infinite, an AF operation is performed with a decision on subject movement. If the DVP reference is not infinity, an AF operation is performed without a decision on subject movement. Thus, a lens-exchangeable camera can be provided capable of preventing malfunction due to an inappropriate reference position for forward movement of the lens.