Abstract: The present invention relates to a learning system using an OID pen, the learning system including a plurality of textbooks, in which texts and drawings are formed in a dot code, an OID pen to read and decode dot code information formed in a corresponding area when a specific area of the textbook is touched by the OID pen and generate a digital code based on the dot code information, and a smartphone to store content information and operating application corresponding to each textbook at a designated area, wherein the OID pen is connected to the smartphone, any one content corresponding to each textbook may be selected, and corresponding image data or audio data of the content based on the digital code determined when the dot code is read by the OID pen are loaded and outputted.