1. A determination method executed by a computer, the determination method comprising: receiving a request of a change from a first system configured by a first configuration to a second system configured by a second configuration, the request of the change including configuration data related to the first configuration and change data related to the change from the first configuration to the second configuration; extracting a functional requirement for a function that is realized in the first system based on the configuration data; identifying an operational requirement for realizing the first system based on the functional requirement and data about an operational process that is used for the first system; identifying a constraint condition about the second system based on configuration elements of the second configuration that are identified by the configuration data and the change data; and determining feasibility of the change to the second system based on the functional requirement, the operational requirement, and the constraint condition.