The present invention relates to a robot apparatus and an output control
method adapted for the robot apparatus. The method includes steps of:
receiving radio frequency (RF) signals of identification (ID) codes from
several wireless communication devices within a predetermined area and
time period; sensing people and obtaining the number of people within the
predetermined area and time period; comparing current ID codes and the
number of people in the predetermined area with what were determined
previously, generating an update signal when the comparison is not equal;
replacing the previous data with the current data; acquiring output data
based on the associated output found in the output table; and performing
an output based on the output data.