Identifying unit identifies a character selected by a user from among plural characters in a terminal, through communication with the terminal via communication unit. Comparison unit, when a first character is identified by identifying unit, compares a history of selections of the first character and a history of selections of a second character with reference to history database. Output unit outputs expression data based on a result of the comparison by comparison unit with reference to expression database, which data represents an expression used when the first character interacts with the user.