A communication system including a first communication apparatus having an image forming unit for forming an image on a sheet and a first wireless communication unit for performing wireless communication, and a second communication apparatus having a second wireless communication unit for performing wireless communication and a reading unit for reading an image. The first communication apparatus registers first network information and prints a QR code based on second network information. The second communication apparatus reads the QR code-printed sheet to acquire the second network information, requests the first communication apparatus to establish direct wireless communication based on the second network information, acquires the first network information from the first communication apparatus using the direct wireless communication, and connects to a router based on the first network information to start wireless LAN communication.