This information processing method is executed by an electric light bulb light source apparatus, which includes a lighting unit, and a functional unit, the information processing method including: selecting, from any of a parent mode and a child mode, an operation mode for cooperative control with a different electric light bulb light source apparatus with respect to the functional unit, and setting the selected operation mode. In a case where the parent mode is set, the lighting unit is caused to execute a first lighting operation for the parent mode in response to a predetermined lighting control signal relating to an operation of the lighting unit, and a cooperative control signal for causing a second lighting operation for the child mode to be executed is transmitted to the different electric light bulb light source apparatus set to the child mode, the second lighting operation for the child mode being different from the first lighting operation. In a case where the child mode is set, the lighting unit is caused to execute the second lighting operation on the basis of the cooperative control signal transmitted from the different electric light bulb light source apparatus set to the parent mode.