A tool for assisting the operation of a network of interconnected items of physical equipment each item having transmission, storage and/or digital data processing capacities, comprising: ▪ a physical infrastructure manager (401, 401-i) associated with a first storage of physical resource status data; this first data storage being arranged in a first data structure (2760; 2770; 2780) in which an identifier is matched with dated values of quantitative magnitudes; the physical infrastructure manager (401, 401-i) being adapted to register at least some of the network equipment as resource in the first data storage, with: - as resource identifier, an equipment identifier, and - as dated values of quantitative magnitudes, a first sequence of dated values of processing, storage and/or transmission capacity of the equipment concerned defining a global, utilizable capacity of the resource; ▪ a virtual infrastructure manager associated with a second storage of status data of a virtual infrastructure; the second data storage being arranged in a second data structure (2730; 2740; 2750) in which an identifier is related with dated values of quantitative magnitudes; the virtual infrastructure manager being adapted to register virtual units in the second data storage, with: - as identifier, an identifier of the unit, and - as dated values of quantitative magnitudes, a second sequence of dated values of processing, storage and/or transmission capacity of the virtual unit defining a global utilizable capacity of the unit; the virtual infrastructure manager further being associated with a third data structure in which a virtual unit identifier is associated with a group of resource identifiers and hence with the corresponding sequences of dated capacity values; the first, second and third data structures thereby defining a virtual infrastructure object corresponding to a virtual unit identifier, for at least some of these identifiers, whilst maintaining correlation between the first and second sequences of dated values of processing, storage and/or transmission capacity; ▪ a network manager in charge of holding rights and capacities for users as a function of time; the virtual infrastructure manager being arranged to reconfigure dynamically a virtual infrastructure object in relation to the requested rights and capacities; this reconfiguration comprising a reconfiguration of the content of the third data structure associated with the virtual infrastructure object and/or a reconfiguration of the content of the first data structure concerned by the virtual infrastructure object. ▪ a physical infrastructure manager (401, 401-i) associated with a first storage of physical resource status data; this first data storage being arranged in a first data structure (2760; 2770; 2780) in which an identifier is matched with dated values of quantitative magnitudes; the physical infrastructure manager (401, 401-i) being adapted to register at least some of the network equipment as resource in the first data storage, with: - as resource identifier, an equipment identifier, and - as dated values of quantitative magnitudes, a first sequence of dated values of processing, storage and/or transmission capacity of the equipment concerned defining a global, utilizable capacity of the resource; - as resource identifier, an equipment identifier, and - as dated values of quantitative magnitudes, a first sequence of dated values of processing, storage and/or transmission capacity of the equipment concerned defining a global, utilizable capacity of the resource; ▪ a virtual infrastructure manager associated with a second storage of status data of a virtual infrastructure; the second data storage being arranged in a second data structure (2730; 2740; 2750) in which an identifier is related with dated values of quantitative magnitudes; the virtual infrastructure manager being adapted to register virtual units in the second data storage, with: - as identifier, an identifier of the unit, and - as dated values of quantitative magnitudes, a second sequence of dated values of processing, storage and/or transmission capacity of the virtual unit defining a global utilizable capacity of the unit; the virtual infrastructure manager further being associated with a third data structure in which a virtual unit identifier is associated with a group of resource identifiers and hence with the corresponding sequences of dated capacity values; the first, second and third data structures thereby defining a virtual infrastructure object corresponding to a virtual unit identifier, for at least some of these identifiers, whilst maintaining correlation between the first and second sequences of dated values of processing, storage and/or transmission capacity; - as identifier, an identifier of the unit, and - as dated values of quantitative magnitudes, a second sequence of dated values of processing, storage and/or transmission capacity of the virtual unit defining a global utilizable capacity of the unit; ▪ a network manager in charge of holding rights and capacities for users as a function of time; the virtual infrastructure manager being arranged to reconfigure dynamically a virtual infrastructure object in relation to the requested rights and capacities; this reconfiguration comprising a reconfiguration of the content of the third data structure associated with the virtual infrastructure object and/or a reconfiguration of the content of the first data structure concerned by the virtual infrastructure object.