Abstract: A method for screening a compound capable of regulating gene expression by binding to a transcription product particularly for obtaining a drug candidate compound. The method includes selecting a stem-loop structure as a desired motif in an RNA, inputting a parameter of a specific stem-loop structure, and executing a plurality of RNA higher-order structural analysis programs to search/extract a sequence that can assume the structure in a molecule thereof from an mRNA sequence, selecting a specific target sequence in a specific transcription product as an indicator of the position at which the stem-loop structure is present in the molecule in an mRNA having significance for development of a potential drug target in an object disease or the like from the extracted mRNA, designing/preparing a labeling probe on the basis of the sequence, performing screening using the labeling probe as an assessment system, and acquiring a low-molecular-weight compound that selectively stabilizes the stem-loop structure.