The information sharing method of the present invention is realized by an information sharing system that includes: first and second mobile terminals and an information sharing server. The first mobile terminal first reads, from a radio tag that is embedded in an information transmitting medium, positional information and an identification number of the information transmitting medium, and then transmits this information to the information sharing server. The information sharing server selects relevant information that shows detailed content of the information transmitting medium based on the identification number of the information transmitting medium that has been transmitted in from the first mobile terminal. The information sharing server then transmits the positional information of the information transmitting medium that has been transmitted in from the first mobile terminal and the above-described relevant information of the information transmitting medium that has been selected to the second mobile terminal.