To output only a guidance matching the convenience, skillfulness, etc., of an operator by grouping guidance information and optionally setting whether or not the guidance information is outputted, group by group.

When voice guidances are grouped and stored by kinds, an output flag indicating whether or not the voice guidances are outputted by the groups is optionally set in a voice data management table 2-3. In this state, a CPU 1 decides the group that a voice guidance belongs to in the output timing of the voice guidance and also controls whether or not the voice guidance is outputted by referring to the output flag corresponding to the group.