The present invention permits users to obtain detailed information
concerning those portions of web contents in which they are most
interested and provides an information extraction system. In an
embodiment, the information extraction system comprises a server and a
client, connected via a communication network, wherein the server
provides a data file for a client to browse; and wherein the client
includes a browser for displaying the contents of the data file that is
received from the server via the communication network, an operation
event detection analyzer for detecting a predetermined specific operation
based on a user's operation when the user reads the contents of the data
file displayed by the browser, and a text extractor for extracting
information that is displayed at a location whereat the specific
operation that is detected by the operation event analyzer is performed
on a display screen of the browser.