Polish-born Krzysztof Wodiczko is a contemporary artist who delivers a social critical message in attention to the meaning of public space. The study is about 'Talking Monument' which corresponds to public projection among various works of Wodiczko, and through this work, the author tried to examine the meaning of the remarks which the weak speak in society and the counter-monumental strategy using a monument. The name of the work called 'Talking Monument' is the author's term, and the author used this term for the work of Wodiczko which performs the projection of the interview image of the participant on a monument with historical significance. From the "City Hall Tower Projection, Krakow" work in 1996 to the recent work, the author divided the testimony uttered in Wodiczko's Talking Monument into social and personal testimonies according to their nature and examined the implications of the participants’ remarks. Social testimonies mean speaking out social and political problems in public, and these remarks became a driving force for social change by practicing democracy. In addition, personal remarks are testimonials to confess one's own wounds which it has been difficult to say about so far. Through this, participants were able to confront individual trauma and find a point to be connected with society again. On the other hand, the historic monument, which is a place of remarks and serves as an instrument, played the role of a 'cultural prosthetics' to help the weak to speak. The contemporary public space has been dominated by the history of winners, so the story of marginalized losers is easily excluded and forgotten, but Wodiczko established an counter-monumental strategy to draw the loser's remarks through Talking Monument. Thus, in this study, the author found that Talking Monument contained the diverse voices produced by conflicts and wounds, and presented a space for social transformational action mode.