A character input device according to one or more embodiments may include a controller including a suggestion controller and a display controller, and a database. The database stores a normal predictive conversion suggestion, a group including a plurality of group conversion suggestions each having a common element, and a symbol representing an attribute that classifies the plurality of group conversion suggestions by a characteristic different from the common element in the group. The suggestion controller may detect a reading of an input character and detects, in response to the reading of the input character at least partially matching a name of the group, the symbol representing the attribute of the group. The display controller may display the normal predictive conversion suggestion and the symbol.