An information processing system causes a screen displayed by an information processing terminal to transition to another screen according to an operation by a user. The information processing system includes a screen configurator configured to generate screen data of the screen and cause the information processing terminal to display the screen, the screen being configured to accept, from the user, a selection operation of a parameter, a deletion operation of the parameter, a validation operation of the selected parameter, and a cancellation operation of the selection operation; and an information manager configured to manage parameter information of the parameter for which the validation operation was last accepted, held by a holder. The screen configurator generates the screen data so as to reject the deletion operation of deleting the parameter for which the validation operation was last accepted, based on the parameter information.