A user activity support agent in a user support apparatus includes a target detection evaluation module configured to detect demand, desire, and/or instruction of the user in the form of a target based on a user's activity state and/or an environment situation detected by a sensor group, and to ask the user whether or not the target is desired by the user via a user information providing device to evaluate the user's reaction to the information, and an activity plan evaluation module configured to plan the detected target in such a manner as to realize the target by the user's activity group, and to provide the user with information suggesting the activity group via the user information providing device to perform monitoring and/or evaluation with respect to the user's reaction to the information from the user's activity state and/or the environment situation.