A system and method are provided for helping implant a hip prosthesis in an individual, which includes an acetabulum intended to be placed in the hip bone of the patient and a femoral part intended to be integrally connected to the femur of the individual. The method includes: obtaining, before the operation, images issued by a device that images a human body and locates a position of images in space. The images are taken in at least three reference positions: standing; recumbent; and sitting. Before the operation, the method determines a pelvis version of the individual in different positions by analyzing the images. During the operation, the method measures a position of the acetabulum with relation to the pelvis of the individual, and simultaneously restores information representative of prosthetic mobility of the hip with relation to each of the reference positions, for a current position of the acetabulum.