In a communication system, an image forming apparatus sends an address of a receiving section to a mobile terminal. The mobile terminal receives a selection of an image data among plural thumbnails displayed on a display section, and wirelessly sends the selected image data to the image forming apparatus with the address. The image forming apparatus receives the selected image data sent with the address by the mobile terminal, and prints an image based on the selected image data. A communication between the mobile terminal and the image forming apparatus is performed wirelessly with an IEEE 802.11 standard. The image forming apparatus rejects a connection establishment request from another mobile terminal except for the mobile terminal, when the wireless communication with the mobile terminal is established.