operation retrieval of webpage which includes content that actively changes on client side . when transmitting a webpage to a web browser , a web server detects an operation log acquisition function operating in the client &# 39 ; s browser , detects web page text layout changes , and inserts and transmits a saved difference detection function . web browser executes the difference detection function that was inserted in the web page that was received and saves the text layout of the webpage as a first text layout . web browser executes the operation log acquisition function and generates and saves the operation log for web page , executes the difference detection function , compares text layout of webpage and first text layout , and if there is a disparity , makes a link between the disparity and the operation log . the log coordination server retrieves the operation of the web application , using the disparity that was linked to the operation log