The selection of finishing materials in the design stage is an important management factor in terms of use safety and satisfaction, and construction cost and process. However, selection of materials in the design stage is usually conducted without related guidelines or a set process, but depends on the experience of the architect or advice of materials company employees. Therefore, the aim of this study was to develop a finishing materials selection process that can be used by a architect. Materials selection related rules collected through interview with experts and five office building cases were used as knowledge. In addition, another aim of the study was to propose a prototype system interface for use in the field. The results of the evaluation of the effectiveness of the process and the system, through case study and interviews with experts, generated a positive rating that implied a improvement in the materials selection process.