A method includes an accepting step of causing an information processing apparatus to accept a request for switching a contracted device from a first image forming apparatus to a second image forming apparatus, the contracted device being an image forming apparatus allowed to use contracted consumables accommodating printing materials based on a contract, an enablement-establishing step of causing the information processing apparatus to establish a first enabled state in which the second image forming apparatus is allowed to use a contracted consumables, in response to acceptance of the request, and an enablement-continuing step of causing the information processing apparatus to establish a second enabled state in which the first image forming apparatus is allowed to continuously use the contracted consumables that has been previously used in the first image forming apparatus for a predetermined period, in response to acceptance of the request.