A communication system and a communicating connection method are disclosed. The communication system comprises a first user side, a second user side and a cloud platform. The first user side has a first identity identification code, a first space identification code or a combination thereof. The second user side has a second identity identification code, a second space identification code or combination thereof. The cloud platform comprises a cloud database and a cloud processing module. When the first user side is positioned, the cloud processing module matches and establishes the first user side and the second identity identification code, the second space identification code or the combination thereof, to connect the first user side and the second user side by a VoIP technology. |