Information processing apparatus and method, recording medium product, and program

Communication connection for peer-to-peer communication is established as follows. One personal computer, which wants to commence communication, transmits an electronic mail attached with an IP address of one personal computer to another personal computer, which is a desired destination. Another personal computer opens the transmitted electronic mail and obtains the IP address attached to the electronic mail, thereby establishing the communication connection. Information necessary for establishing the communication connection in peer-to-peer communication can be easily acquired.