From the information which is included in the Web page of the time when it differs, the finite difference information which deals with only the information of the specification which the user needs is made to calculate. The Web page collection section of the finite difference calculation device collects the Web page on the basis of the search key. The information extraction section, the store name which is the extraction object from the Web page which was collected, extracts address and telephone number. The extraction information adjustable section the store name which is extracted, adjusts converts the information of the extraction which includes address and telephone number. The extraction information housing section makes information of extraction the extraction information file remember. The finite difference calculation section executes the finite difference calculation processing which calculates the finite difference between information of the extraction which belongs to the respective relative object time when two relative object times are appointed. The calculation result indicatory department makes the finite difference calculation result in the monitor indicate.
展开▼
