1. A control method executed by a computer, the control method comprising: acquiring a first image; determining whether the first image is a transmission target to another computer; when the determining determines that the first image is an image as the transmission target, executing detection processing of detecting a reference object from the image, generating image information of a superposition image in which a content image corresponding to the reference object detected by the detection processing is superimposed over the image when the reference object is detected from the image, transmitting the image information to the other computer, and acquiring a second image which is photographed after the first image for a next determining, wherein when the determining determines that the first image is not the transmission target, the detection processing and the generating of the image information is not performed relative to the first image and the second image is acquired for the next determining.