An information processing apparatus capable of performing application installation control while taking into account amounts of resources to be changed by installation of an extension application to be attached to an associated application. When a fragment bundle is installed, total values of amounts of the resources used by installed applications including a host bundle assumed to have been extended in function by the fragment bundle are calculated. It is determined whether the total values are within allowable upper limit values allowed by the apparatus. If it is determined that the total values are within their allowable upper limit values, the fragment bundle is installed.