An image composing method searches other electronic devices nearby via a communication unit, selects a number of electronic devices from the searched other electronic devices to determine slave members of a sharing community, and selects a number of slave members from the slave members of the sharing community to be capturing devices. The method identifies an object, determines a capturing position of each capturing device according to the object, the number of the capturing devices, and a predetermined manner, and controls each capturing device to move to a corresponding capturing position. The method further instructs each capturing device to take image according to the predetermined manner and receives the image from each capturing device, and integrates the images taken by the capturing devices to generate a single composed image. A related electronic device and a related non-transitory storage medium are also provided.