1. A client system comprising: a display means for displaying an image on a screen; a reception means for receiving search result question information or search result answer information, screen data for displaying a search information input region for inputting search information, and a search result display region for displaying searched questions or answers; a control means for controlling the display means to perform an operation to display a searched question or an answer; and a transmission means for transmitting identification information for identifying the user, and search information for searching for a question or an answer.