1. An apparatus for treatment of diagnostic information relating to samples of microbiological material, in which the apparatus comprises: a processor; a viewing device operatively connected to the processor; and a memory storing a software program that when executed on the processor causes the processor to perform the following operations: defining a user interface, for treatment of diagnostic information relating to samples of microbiological material, on the viewing device and retrieving and visualising, in the user interface, a datum, or a plurality of data, relative to a same examination site; retrieving a first image of a first support, of a first type, for microbiological culture, where the first support comprises a Petri dish with a terrain for bacterial culture, relative to a first microbiological sample coming from the examination site and enabling selective viewing of the first image in the user interface; retrieving a second image of a second support of a second and different type, for microbiological samples, where the second support comprises a slide for Gram staining of microorganisms, and/or a slide for morphological analysis of microorganisms, relative to a second microbiological sample coming from the examination site and enabling selective viewing of the second image in the user interface, in order to enable the user, by the user interface, to make a combined use and evaluation, by a simultaneous and contextual or subsequent viewing, of the data relating to the examination site and of the images relating to the first and the second support correlated to the examination site.