An automatic accompaniment apparatus that enables an external electronic
musical instrument connected thereto to exhibit its accompaniment
information generating capability to the maximum and makes it possible to
set tone color data and accompaniment data adapted to the external
electronic musical instrument through the automatic accompaniment
apparatus. The external electronic musical instrument stores in advance a
plurality of tone color data and/or a plurality of accompaniment data and
generates accompaniment information based on the selected tone color data
and/or accompaniment data. List information on the stored tone color data
and/or the accompaniment data is acquired via a control interface that
connects to the external electronic musical instrument and carries out
transmission and reception of information to and from the external
electronic musical instrument, and the acquired list information is
presented to a user. Control information for causing the external
electronic musical instrument to set tone color data and/or accompaniment
data selected by the user from the presented list information is
transmitted to the external electronic musical instrument via the control
interface.