It has been difficult to advance reduction in load to be applied on the earth resource and the global environment. An environmental load assessment system comprising a server for storing as data (a) a unit environmental load of constituent materials constituting a product and (b) a load ratio of an environmental load of constituent materials constituting a reference product to a total environmental load of the reference product; component information terminals for inputting information relating to weights of constituent materials constituting an object product; the server for calculating a total environmental load of the object product based on the stored data and the inputted information.