Provided is a device design support apparatus in which a data input-output portion receives an input of a first device provisional specification relating to a device from a customer, a database generating portion generates a second database based on a first database stored in a database storing portion and the first device provisional specification, and a device specification generating portion generates a second device provisional specification relating to the device based on the second database, presents the second device provisional specification to the customer by outputting the generated second device provisional specification through the data input-output portion, receives the input of a change content of the second device provisional specification from the customer, and generates a device fixed specification of the device based on the second device provisional specification and the change content.