A system includes a drone including an onboard entity; and a control entity for controlling the drone and situated remotely from the drone. The control entity enables an operator to select data for sending to the onboard entity, the onboard entity being adapted to execute actions as a function of the received data. The onboard entity is arranged to generate a message on the basis of the data as produced by the control entity and as received by the onboard entity, and to transmit the message to the control entity. The control entity acts via warning means to generate an information signal representative of said message. The operator can then act via validation means to cause an intention message to be transmitted that authorizes or does not authorize execution of said actions by the drone.