Under rapidly changing circumstances, public libraries are required to evaluate the performance with an integrated point of view to cope with a variety of changes. In other words, it is necessary to develop integrated library performance appraisal indicators which are both quantitative and qualitative. Recently, ISO and IFLA attempt to adopt an integrated performance evaluation system based on the Balanced Scorecard(BSC). Therefore, this study defines four aspects of the library appraisal including input, process, output and outcome, and suggests a new library appraisal system and indicators of each appraisal aspect. In the concrete, appraisal aspects were derived from ISO appraisal system, and an appraisal system and indicators were presented based on the comparison and analysis of the ones respectively used inside and outside of Korea. Finally, this study proposes the method of suitability evaluation of those performance indicators by librarians and professors in Korea.