Abstract: Disclosed in the present disclosure is a method, an apparatus, a system, a device, a storage medium, and a program product for transmitting composite photo data, the method including: responding to a first transmission request triggered by a first user; obtaining target composite photo data directed by the first transmission request, in which the target composite photo data includes at least one piece of first photo data and at least one piece of first video data corresponding to the first photo data; compressing and processing the target composite photo data according to the first photo data to obtain first compressed data having an identical data facade to that of the first photo data; and transmitting the first compressed data to a first terminal position corresponding to the first transmission request.