A file transmission method, a file transmission apparatus, and a file transmission system are provided. The method is adapted for a first electronic apparatus to perform a file transmission operation with a second electronic apparatus. The method includes following steps: capturing a target image including a selection region displayed by the second electronic apparatus, wherein the selection region is displayed by the second electronic apparatus in response to a selection operation performed on at least one item displayed by the second electronic apparatus; identifying an encoded pattern located within the selection region in the target image, and decoding the encoded pattern to obtain connection information of the item; and transmitting at least one file with the second electronic apparatus according to the connection information.