To efficiently retrieve Web pages in such configurations desired by a user.

When the sample data group of a coupon page and the sample data group of a normal page are input together with information showing the classification of the sample data to an NB10 in which an axial group composed of axes including a plurality of elements is set for operating an output selected by using a probability theory in response to inputs, prior probability for each element to be output from the NB10 based on each input data and each piece of information and each element is selected by using a filter 20 which operates selection based on a probability value. An SVM 40 is provided which is learned by inputting the prior probability selected by the filter 20 as a set of information showing which of the coupon page and the normal page is pertinent to input data selected by the filter 20 from among input data configuring each sample data group input to the NB10 in the mode of vector data.

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