A mobile terminal comprising: a terminal main body; a memory unit configured to store information regarding a main user of the mobile terminal and corresponding main user images; a display unit configured to display screen information that has been received or transmitted; and a user tracking unit including a camera (121; 221) and configured to obtain a user image; characterized in that: the user tracking unit is further adapted to recognize both the presence or absence of a user (400, 500) and a location of the user within a certain range based on the terminal main body by using the camera (121; 221); and the mobile terminal further comprises a controller configured to: compare a user image previously stored in the memory unit and the user image obtained from the camera (121; 221) to extract user information corresponding to the obtained user image, and to generate a control signal for controlling a function of the terminal based on both of the presence or absence of the user and the user location; cause a portion of the screen information to disappear when a different user different from the main user is detected, wherein the different user is included in a second group, and the second group is different from a first group; and restore the screen information displayed on the display unit when the different user is recognized to be located outside of a certain range based on the terminal main body, wherein the portion of the screen information includes a received text message. a terminal main body; a memory unit configured to store information regarding a main user of the mobile terminal and corresponding main user images; a display unit configured to display screen information that has been received or transmitted; and a user tracking unit including a camera (121; 221) and configured to obtain a user image; characterized in that: the user tracking unit is further adapted to recognize both the presence or absence of a user (400, 500) and a location of the user within a certain range based on the terminal main body by using the camera (121; 221); and the mobile terminal further comprises a controller configured to: compare a user image previously stored in the memory unit and the user image obtained from the camera (121; 221) to extract user information corresponding to the obtained user image, and to generate a control signal for controlling a function of the terminal based on both of the presence or absence of the user and the user location; cause a portion of the screen information to disappear when a different user different from the main user is detected, wherein the different user is included in a second group, and the second group is different from a first group; and restore the screen information displayed on the display unit when the different user is recognized to be located outside of a certain range based on the terminal main body, wherein the portion of the screen information includes a received text message. the user tracking unit is further adapted to recognize both the presence or absence of a user (400, 500) and a location of the user within a certain range based on the terminal main body by using the camera (121; 221); and the mobile terminal further comprises a controller configured to: compare a user image previously stored in the memory unit and the user image obtained from the camera (121; 221) to extract user information corresponding to the obtained user image, and to generate a control signal for controlling a function of the terminal based on both of the presence or absence of the user and the user location; cause a portion of the screen information to disappear when a different user different from the main user is detected, wherein the different user is included in a second group, and the second group is different from a first group; and restore the screen information displayed on the display unit when the different user is recognized to be located outside of a certain range based on the terminal main body, wherein the portion of the screen information includes a received text message. compare a user image previously stored in the memory unit and the user image obtained from the camera (121; 221) to extract user information corresponding to the obtained user image, and to generate a control signal for controlling a function of the terminal based on both of the presence or absence of the user and the user location; cause a portion of the screen information to disappear when a different user different from the main user is detected, wherein the different user is included in a second group, and the second group is different from a first group; and restore the screen information displayed on the display unit when the different user is recognized to be located outside of a certain range based on the terminal main body, wherein the portion of the screen information includes a received text message.