The embodiment of the invention provides a combined supply system and method. According to the combined supply system and the combined supply method, the technical problem of low comprehensive utilization rate of solar energy in the prior art is solved. The combined supply method is applied to the combined supply system. The combined supply system comprises a cogeneration subsystem, a water diversion device, a heat supply subsystem and a cooling subsystem, wherein the cogeneration subsystem comprises a cogeneration assembly and a heat exchange device, the cogeneration assembly is capable of converting the solar energy into heat energy, and the heat exchange device is used for transferring the heat energy into internal first liquid and outputting the first liquid through an output hole; and the water diversion device is used for receiving the first liquid which absorbs the heat energy and respectively conveying the first liquid into the heat supply subsystem and the cooling subsystem, the heat supply subsystem is used for supplying heat by virtue of the first liquid, and the cooling subsystem is used for cooling by virtue of the first liquid, so that the requirements on hot water and cold water of a terminal user are met.