1. A screen object positioning device in program development comprising: a parent object generating unit configured to generate a parent object having predetermined first object position information; a first child object generating unit configured to generate a first child object which is placed on the parent object and which has second object position information corresponding to a first positioning rule calculated using the first object position information; and a second child object generating unit configured to generate a second child object which is placed on the parent object and which has third object position information corresponding to a second positioning rule calculated using the second object position information.