1. A system for piloting a drone in immersion, comprising: a drone provided with shooting means and a ground station comprising: virtual reality glasses rendering images captured via the shooting means and transmitted from the drone by wireless communication means; detecting means for detecting movement of a head of a user wearing the glasses; as well as ground graphic processing means adapted to generate rendered images, a first generating means for generating on board the drone a first image, called a viewpoint image, and transmitting the first image to the ground graphic processing means; modification means provided in the drone to modify a sight axis of the viewpoint image in response movement of the user's head detected by the detecting means and transmitted to the drone via the wireless communication means, a second generating means for generating on board the drone a second image, called a bird's view image, wherein a field of the second image is wider and an angular resolution is lower than the viewpoint image, and transmitting the second image to the ground graphic processing means; and wherein the ground graphic processing means are adapted to generate locally during a movement of the user's head, by a combination of a current viewpoint image and a current bird's view image present in the ground station, images to be rendered, with outlines adjusted as a function of the changes of movement detected by the detecting means.