1. A method for incremental pose estimation and photographing, adapted for an electronic apparatus having an image capturing device comprising a lens and a photosensitive element, a sensor, a timer and a calculation device, comprising: capturing at least two images of a three-dimensional (3D) object at different positions encircling the 3D object by the image capturing device, and detecting displacements and angular displacements of the electronic apparatus by the sensor; calculating a circumference suitable for capturing the images of the 3D object according to a central position of the 3D object and a distance between the 3D object and the electronic apparatus estimated from a plurality of features of the 3D object in the images, the displacements and the angular displacements by the calculation device which is coupled to the sensor; dividing the circumference into a plurality of segments, and adjusting a timing interval of the timer according to a length of the segments by the calculation device; and triggering the image capturing device at the timing intervals by the timer to capture the images of the 3D object.