A service support device comprising: an information processing device configured to i) deliver key information to a plurality of mobile terminals (20; 20Ac; 20Ad; 20B) each corresponding to a respective business operator from a plurality of business operators that provide a user of a vehicle (10; 10A; 10B) with a predetermined service using the vehicle, the key information being information for unlocking the vehicle, starting the vehicle, or unlocking and starting the vehicle when a predetermined transmission signal is transmitted toward the vehicle, and ii) when the mobile terminal corresponding to a first business operator among the plurality of business operators uses the key information, make coordination such that the mobile terminal corresponding to a second business operator among the plurality of business operators does not use the key information, wherein the predetermined service by each of the plurality of business operators is any one of a delivery service that allows a luggage compartment of the vehicle to be designated as a delivery address for a package, a pickup service that allows the luggage compartment to be designated as a pickup address for a package, and a collection service that allows the luggage compartment to be designated as a collection address for an article; the information processing device is configured to deliver the key information to each of the plurality of mobile terminals (20Ac, 20Ad) of workers each corresponding to the respective business operator, who conduct work for delivery of the package, pickup of the package, or collection of the article, the work corresponding to the respective predetermined service; and the information processing device is configured to, when a worker corresponding to the first business operator, among the workers, is doing the work based on usage of the key information by the mobile terminal of the worker corresponding to the first business operator, disable usage of the key information acquired by the mobile terminal of a worker corresponding to the second business operator, among the workers, until the worker corresponding to the first business operator finishes the work. an information processing device configured to i) deliver key information to a plurality of mobile terminals (20; 20Ac; 20Ad; 20B) each corresponding to a respective business operator from a plurality of business operators that provide a user of a vehicle (10; 10A; 10B) with a predetermined service using the vehicle, the key information being information for unlocking the vehicle, starting the vehicle, or unlocking and starting the vehicle when a predetermined transmission signal is transmitted toward the vehicle, and ii) when the mobile terminal corresponding to a first business operator among the plurality of business operators uses the key information, make coordination such that the mobile terminal corresponding to a second business operator among the plurality of business operators does not use the key information, wherein i) deliver key information to a plurality of mobile terminals (20; 20Ac; 20Ad; 20B) each corresponding to a respective business operator from a plurality of business operators that provide a user of a vehicle (10; 10A; 10B) with a predetermined service using the vehicle, the key information being information for unlocking the vehicle, starting the vehicle, or unlocking and starting the vehicle when a predetermined transmission signal is transmitted toward the vehicle, and ii) when the mobile terminal corresponding to a first business operator among the plurality of business operators uses the key information, make coordination such that the mobile terminal corresponding to a second business operator among the plurality of business operators does not use the key information, wherein the predetermined service by each of the plurality of business operators is any one of a delivery service that allows a luggage compartment of the vehicle to be designated as a delivery address for a package, a pickup service that allows the luggage compartment to be designated as a pickup address for a package, and a collection service that allows the luggage compartment to be designated as a collection address for an article; the information processing device is configured to deliver the key information to each of the plurality of mobile terminals (20Ac, 20Ad) of workers each corresponding to the respective business operator, who conduct work for delivery of the package, pickup of the package, or collection of the article, the work corresponding to the respective predetermined service; and the information processing device is configured to, when a worker corresponding to the first business operator, among the workers, is doing the work based on usage of the key information by the mobile terminal of the worker corresponding to the first business operator, disable usage of the key information acquired by the mobile terminal of a worker corresponding to the second business operator, among the workers, until the worker corresponding to the first business operator finishes the work.