1. A method for processing local information acquired by a virtual representation and a device comprising an inertial unit and an image sensor, comprising the steps of: capturing at least one image of a real environment of the device; localizing the device by correlating portions of said at least one captured image and portions of the virtual representation to obtain localization of the device in the virtual representation, corresponding to the localization of the device in the real environment, by automatic recognition, in said at least one captured image, of visual, multimodal and non-ambiguous seamarks that are predefined in the virtual representation, wherein the localization initializes the device that is uninitialized; determining a displacement of the device at least by the inertial unit; modifying the localization of the device in the virtual representation as a function of the displacement determined by the inertial unit so that a real position of the device corresponds, during the displacement, to the localization of the device in the virtual representation; jointly displaying said at least one captured image and a portion of the virtual representation corresponding to the displayed captured image; and modifying the virtual representation by editing localized information related to the real environment, such as an indication of nonconformity, a measurement of pressure, temperature or lighting level, on the virtual representation.