This article suggest a research method to extract user needs for designing social interface of a service robot. We first discuss social design issues for the service robot. Then we present a novel survey method for the service robot based on the social design issues and robot characteristics. Finally we discuss survey results, answered by Korean customers, of functional needs, social characteristics, product design for a home service robot. It is analyzed that Korean customers expect the image of home service robot as “a late teenager female who helps household work effectively”