A device comprising: a communicator configured to communicate with a plurality of wearable devices that are worn on a user's body; and a controller configured to: receive, via the communicator, a plurality of pieces of movement pattern information of the plurality of wearable devices ; compare the received plurality of pieces of movement pattern information of the plurality of wearable devices with movement pattern information which is pre-stored in a memory; based on a result of the comparing, determine wearing positions that correspond to each of the received plurality of pieces of movement pattern information for each of the plurality of wearable devices ; determine a type of activity performed by the user based on the received plurality of pieces of movement pattern information; determine a main controlled-device (200-1) that corresponds to the determined activity type of the user for measuring an amount of the activity being performed by the user from among the plurality of wearable devices , based on the determined wearing positions for each of the plurality of wearable devices; and control, via the communicator , the main controlled-device (200-1) to operate for measuring the amount of the activity being performed by the user, and to control, via the communicator , to turn off the plurality of wearable devices excluding the main controlled-device (200-1). a communicator configured to communicate with a plurality of wearable devices that are worn on a user's body; and a controller configured to: receive, via the communicator, a plurality of pieces of movement pattern information of the plurality of wearable devices ; compare the received plurality of pieces of movement pattern information of the plurality of wearable devices with movement pattern information which is pre-stored in a memory; based on a result of the comparing, determine wearing positions that correspond to each of the received plurality of pieces of movement pattern information for each of the plurality of wearable devices ; determine a type of activity performed by the user based on the received plurality of pieces of movement pattern information; determine a main controlled-device (200-1) that corresponds to the determined activity type of the user for measuring an amount of the activity being performed by the user from among the plurality of wearable devices , based on the determined wearing positions for each of the plurality of wearable devices; and control, via the communicator , the main controlled-device (200-1) to operate for measuring the amount of the activity being performed by the user, and to control, via the communicator , to turn off the plurality of wearable devices excluding the main controlled-device (200-1). receive, via the communicator, a plurality of pieces of movement pattern information of the plurality of wearable devices ; compare the received plurality of pieces of movement pattern information of the plurality of wearable devices with movement pattern information which is pre-stored in a memory; based on a result of the comparing, determine wearing positions that correspond to each of the received plurality of pieces of movement pattern information for each of the plurality of wearable devices ; determine a type of activity performed by the user based on the received plurality of pieces of movement pattern information; determine a main controlled-device (200-1) that corresponds to the determined activity type of the user for measuring an amount of the activity being performed by the user from among the plurality of wearable devices , based on the determined wearing positions for each of the plurality of wearable devices; and control, via the communicator , the main controlled-device (200-1) to operate for measuring the amount of the activity being performed by the user, and to control, via the communicator , to turn off the plurality of wearable devices excluding the main controlled-device (200-1). <EOS>