A method and apparatus of upgrading software in a digital broadcasting receiver are provided. The apparatus includes a receiving unit which receives upgrade information including information on versions of a plurality of modules included in the software and information on an upgrading method, and an upgrading unit which performs the upgrading of the software according to the upgrade information by using upgrade data. Accordingly, only the modules which need upgrading can be selectively upgraded, so that it is possible to increase the efficiency of the upgrading.