A communication terminal, installed with a plurality of types of communication application, receives first terminal identification information for identifying the first communication terminal from a second mobile terminal, after the second mobile terminal has received the first terminal identification information from a first mobile terminal, the first mobile terminal being a mobile terminal that has obtained the first terminal identification information from the first communication terminal through a first communication session. The communication terminal activates one of the plurality of types of communication application based on the first terminal identification information, and starts communicating with the first communication terminal through a second communication session using the activated communication application.