An image sharing method for sharing an image between a first information processing device and a second information processing device includes: when a first drawing is executed on a shared layer shared with the second information processing device, causing the first information processing device to transmit a first object generated by the first drawing to the second information processing device; when a second drawing is executed on an unshared layer not shared with the second information processing device, causing the first information processing device not to transmit a second object generated by the second drawing to the second information processing device; and causing the first information processing device to variably control one of a size and a position within the screen of the unshared layer, or both of the size and the position within the screen of the unshared layer.