Fecha de publicación: 08/12/2022 Fuente: WIPO (eseential oils OR extracts) The present invention determines the sameness of incompatible information items.　A storage unit (11) stores an incompatible information item (13) that is for searching for a description incompatible with second software from among source codes using first software and that indicates conditions respectively for keywords having two or more linguistic elements and a positional relationship between two or more linguistic elements. A processing unit (12) extracts two or more keywords from the incompatible information item (13), generates frequency information (15) based on the appearance frequency of the same keywords, generates sequence information (17) indicating the sequence of appearance of the two or more keywords inferred from the condition of the positional relationship, and determines the sameness between an incompatible information item (14) and the incompatible information item (13) on the basis of the similarity between the frequency information (15) and frequency information (16) corresponding to the incompatible information item (14) and the similarity between the sequence information (17) and sequence information (18) corresponding to the incompatible information item (14).