Purpose Identifying and analyzing potential innovative technologies becomes an imperative task. Especially, finding technology which is currently not dominant but has chance to be innovative in the future, which is called weak signal, is critically important. In response, this study suggests a framework and method to identify weak signal, considering both technological and market aspects. Methods Firstly, this study defines the characteristic of weak signals. Next, technology and market database is prepared to check technological novelty and market capability. Third, Local Outlier Factor(LOF) is used to identify technology novelty for technological document. When weak signals are identified, market capabilities are checked based on the market documents. Results Technologies related with autonomous driving technology, autonomous shared car service, and autonomous delivery service using GPS and various sensors are identified as weak signals for promising technologies. Medical technologies are also identified as important signals for future trends of self-driving cars. Conclusion This study is expected to provide significant implications to the innovation practice in term of providing the framework and method for identifying promising technologies.