A programming assisting program causes a computer to function as a project information acquirer that acquires component information indicating a plurality of components included in a project including object-oriented components and relationships, and acquiring relationship information indicating relationships between the plurality of components, a generator that generates a class diagram indicating a structure of the project based on the acquired component information and the acquired relationship information, a display that displays the generated class diagram on a screen, and a display updater that receives a selection operation of selecting a component included in the class diagram displayed on the screen, and updates a display format of the class diagram such that a level of a relationship between the component selected in the selection operation and another component is distinguishable.