A watch type mobile terminal comprising: a main body including a touch screen; a band connected to the main body and configured to surround a user's wrist for wearing the mobile terminal on the wrist and comprising a first band and a second band respectively connected to both sides of the main body, wherein the band is divided into a plurality of areas (305a, 305b, 305c) by fastening between the first band and the second band, wherein the plurality of areas comprise a first area formed in the first band, a second area formed in the second band and a third area corresponding to an overlapped area in which the first and second bands are overlapped with each other; a plurality of sensors provided on the band, the plurality of sensors configured to sense at least one tap applied to at least one of the first area, the second area or the third area comprised in the band; an electric active polymer material contained in the band; a controller configured to: detect, while the touch screen is in a non-activated state, a predetermined pattern, in which a plurality of taps is applied and to perform a function related to health, wherein the pattern is defined by positions at which the plurality of taps are respectively applied on the first area, the second area or the third area, and an order in which the plurality of taps are applied at the positions, execute the function related to the health based on the predetermined pattern while the non-activated state of the touch screen is maintained; and control the band to tighten the wrist when the function related to the health is executed, wherein power is supplied to the electric active polymer to tighten the wrist based on the execution of the function related to the health. a main body including a touch screen; a band connected to the main body and configured to surround a user's wrist for wearing the mobile terminal on the wrist and comprising a first band and a second band respectively connected to both sides of the main body, wherein the band is divided into a plurality of areas (305a, 305b, 305c) by fastening between the first band and the second band, wherein the plurality of areas comprise a first area formed in the first band, a second area formed in the second band and a third area corresponding to an overlapped area in which the first and second bands are overlapped with each other; a plurality of sensors provided on the band, the plurality of sensors configured to sense at least one tap applied to at least one of the first area, the second area or the third area comprised in the band; an electric active polymer material contained in the band; a controller configured to: detect, while the touch screen is in a non-activated state, a predetermined pattern, in which a plurality of taps is applied and to perform a function related to health, wherein the pattern is defined by positions at which the plurality of taps are respectively applied on the first area, the second area or the third area, and an order in which the plurality of taps are applied at the positions, execute the function related to the health based on the predetermined pattern while the non-activated state of the touch screen is maintained; and control the band to tighten the wrist when the function related to the health is executed, wherein power is supplied to the electric active polymer to tighten the wrist based on the execution of the function related to the health. detect, while the touch screen is in a non-activated state, a predetermined pattern, in which a plurality of taps is applied and to perform a function related to health, wherein the pattern is defined by positions at which the plurality of taps are respectively applied on the first area, the second area or the third area, and an order in which the plurality of taps are applied at the positions, execute the function related to the health based on the predetermined pattern while the non-activated state of the touch screen is maintained; and control the band to tighten the wrist when the function related to the health is executed, wherein power is supplied to the electric active polymer to tighten the wrist based on the execution of the function related to the health.