Abstract: A solution provision system including an administrator terminal that transmits information related to a first API for a specific service using an administrator account; a platform server that receives a registration request for a second API for a different service from the specific service from a developer terminal, registers the first API and the second API in an API product list, and provides the API product list to a client terminal using a user interface; and a gateway device that relays a communication connection between the client terminal and a plurality of API servers related to the first API and the second API.