A user data management device, a storage medium which stores a control program, and a control method are disclosed which efficiently report the identity of a user who is using equipment to some or all members of the department in which that equipment is located, or to managers of that department, in order to be informed of the use status of that equipment, and control the use of that equipment by unauthorized users. The user data management device includes input means that inputs user data belonging to a user that will use the equipment, notification means that will provide one or more persons with identity data concerning a user who is using the equipment in which the user data was input, authentication means that authenticates the user from the user data, and notification determination means that will determine one or more persons to be provided with identity data, and then provide identity data to them that identifies the user authenticated with the authentication means by means of the notification means.