1. A method comprising: acquiring, by a processor, a web page description to be edited; detecting, by the processor, a description that refers to a library written in an interpretive language in the acquired web page description; and generating, by the processor, a description of a modified web page in which the web page description is modified by inserting, into the web page description before the web page description is read by a web browser, source code for indicating a trigger for interpretation to be executed upon completion of initialization of the library corresponding to the detected description and code for editing a description in the interpretive language using the library corresponding to the detected description.