1. A script caching method wherein, in a web application, whose functionality is at least partially scripted, in the event that, for each predetermined processing unit in the web application, function names contained in internal code, the internal code comprising a non-transitory computer readable media having machine-executable instructions, to operate a computer having a storage and a hardware processor connected via a network to a terminal device when one of the scripts describing objects processed within said processing unit is defined as a script of interest and said script of interest is converted to internal code are not common with function names contained in internal code when the scripts describing the remaining objects processed within said processing unit are converted to internal code, the internal code of said script of interest is cached.