The courtyard is included on each household. A parent household considers it as a common store, and is taken as the floor planning where each room are circularly arranged centering on a courtyard and which has excursion nature. LDK makes a ceiling high, shows a makeup beam, and, on the whole, is taken as finish of the woody system. The character of the space different from a child household is given. A child household considers it as 2 stories, and is taken as U character type floor planning the center [ a courtyard ].