To facilitate handling, to improve retrievability and to improve the quality of information to be offered by combining the advantages of an electronic recording medium and a paper recording medium.

As plural recording media by the electronic recording medium (provided with a display 7) and the paper recording medium 20 in which mutually related information is recorded, in the electronic recording medium, for the information whose related information is recorded in the paper recording medium 20, the recording position information ('page 78 (2)') of the related information on the paper recording medium 20 is recorded as the information presentable accompanying the information. Also, in the paper recording medium 20, for the information whose related information is recorded in the electronic recording medium, the retrieval information ('365') of the related information in the electronic recording medium is recorded as the information presented accompanying the information.