1. A method for incremental pose estimation and photographing, adapted for an electronic apparatus having an image capturing unit, a sensing unit and a timer, comprising: capturing at least two images of a three-dimensional (3D) object at different positions encircling the 3D object by the image capturing unit, and detecting displacements and angular displacements of the electronic apparatus by the sensing unit; 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; dividing the circumference into a plurality of segments, and adjusting a timing interval of the timer according to a length of the segments; and triggering the image capturing unit at the timing intervals set by the timer to capture the images of the 3D object.