The invention relates to a humanoid robot which is capable of surveying its environment, notably to determine when humans are present and to engage in Activities with said humans corresponding to an evaluation of the their desires. An operating system of the robot is configured in the robot to process the information received by Extractors (sensors and processing capabilities), to list Activities (gestures, dialogs, etc..) which are prioritized as a function of the current conditions and the history of engagement with the humans, to decide which Activity is to be launched and to have Actuators execute the Activity. Safeguard conditions of the robot are also taken into account in the list of Activities to be performed.