Public opinion trend analysis method and system based on keyword frequency statistics

The invention discloses a public opinion trend analysis method and system based on keyword frequency statistics. The method comprises the steps that speech content is obtained from an application and a social media platform to serve as basic data of public opinion analysis; cleaning the basic data, and filtering advertisement data; and extracting hot keywords, constructing a public opinion trend graph according to the word frequency trend of the hot keywords, and performing public opinion trend analysis in real time. According to the method, analysis based on an existing corpus is not needed, and keywords can be extracted more flexibly; the speech of the hotspot keyword does not disappear immediately and has a smooth fade-out trend, so that the speech can be used as an analysis reference basis of real-time hotspot public opinions; after the keywords are extracted, statistics of speech trends can be flexibly adjusted according to required time dimensions, and public opinion occurrence time points can be traced