Abstract: An information collecting system includes a dictionary defining the kinds of each supporting information to be added to job-site data and a database of the supporting information. The supporting information is background information including pieces of information indicating an analysis assist material affecting an analysis and an evaluation assist material affecting an evaluation of an analysis result. That is, the job-site data is included as a factor in a fishbone diagram having a shared knowledge of an organization or an organization knowledge as a characteristic, and the background information is other factors in the fishbone diagram including the job-site data as a factor. Each supporting information is searched from the database in accordance with a dictionary, and each searched supporting information is added to the job-site data in addition to attribute data to generate event information.