Industrial societies consume not only physical assets but those intangible assets called service. Labor is therefore defined as service work not when it produces tangible assets but when the labor itself intangible. It is said the word originally came from religious term in ancient Greece. A house in Greek (oikos) or human relationships&sbquo or the community linked with the house comprises husband and wife&sbquo parent and child&sbquo or master and selves as its smallest unit of social life. It is assumed that the word service first appeared in oikonomia which is an oath to a guardian deity&sbquo a symbol of protection for smallest unit. That is&sbquo the concept of doing work by sacrificing oneself even when the guardian deity is not watching is considered to be very close in meaning to this word. The economic term "service" and its religions use are completely different in spirit and their compensatory expectation for the service. Administrative service volunteer activities are non-profit service work. What then is service as design to deign as service? Considering this from the point of view of social ethics and effects to which design should make a contribution&sbquo the original meaning of service in its religions use could be a significant clue. That is&sbquo while design is certainly an activity of creating tangibles&sbquo the intangible effects brought by the tangibles can be clearly called design service as a social profession. In its relationship with industries or economy&sbquo design is a profession in the service industry&sbquo but design as a social service will further clarify the role of design in society and help define the essence of design. So-called "socio-design" should be thought of as service design as an act of constructing idealism in a social movement.