The process of formation of an art concept for the production of a new series of artwork has not yet been empirically elucidated. The goal of this study is to describe the process of art concept formation by a contemporary artist through quantitative analyses of a text corpus based on interviews with the artist. From an analysis of the frequency of occurrence of items of vocabulary in the interview data and the TF-IDF, we find that the second of three phases in the artist's creative process was the most critical for the formation of the art concept, as also shown in our previous qualitative study. Additionally, it is demonstrated that the contents of the art concept, White Noise, were continuously modified and developed over time. Further, based on an analysis of co-occurrence frequencies of words, the structure of the art concept is deduced from the importance of co-occurring vocabulary.