A mobile terminal (100B, 200B, 300B, 400B), comprising: a wireless communication processor configured to receive a signal from a first external device (300A, 400A) notifying an emotional state of a first user of the first external device (300A, 400A); a display; a camera; and a controller configured to: when the signal notifying the emotional state of the first user is received while a predetermined application is executed in the mobile terminal (100B, 200B, 300B, 400B), control the wireless communication processor to transmit the signal notifying the emotional state of the first user to a second external device, activate the camera and display a preview image on the display obtained by the activated camera in response to the emotional state of the first user being a specific emotional state, control the wireless communication processor to transmit status information of the mobile terminal (100B, 200B, 300B, 400B) to the second external device in response to activation of the camera, wherein the status information includes implementation information of the camera, control the camera to capture the preview image in response to a predetermined condition without a capture command of a user of the mobile terminal, control the wireless communication processor to transmit the captured image to the second external device, and output information indicating the specific emotional state of the first user. a wireless communication processor configured to receive a signal from a first external device (300A, 400A) notifying an emotional state of a first user of the first external device (300A, 400A); a display; a camera; and a controller configured to: when the signal notifying the emotional state of the first user is received while a predetermined application is executed in the mobile terminal (100B, 200B, 300B, 400B), control the wireless communication processor to transmit the signal notifying the emotional state of the first user to a second external device, activate the camera and display a preview image on the display obtained by the activated camera in response to the emotional state of the first user being a specific emotional state, control the wireless communication processor to transmit status information of the mobile terminal (100B, 200B, 300B, 400B) to the second external device in response to activation of the camera, wherein the status information includes implementation information of the camera, control the camera to capture the preview image in response to a predetermined condition without a capture command of a user of the mobile terminal, control the wireless communication processor to transmit the captured image to the second external device, and output information indicating the specific emotional state of the first user. when the signal notifying the emotional state of the first user is received while a predetermined application is executed in the mobile terminal (100B, 200B, 300B, 400B), control the wireless communication processor to transmit the signal notifying the emotional state of the first user to a second external device, activate the camera and display a preview image on the display obtained by the activated camera in response to the emotional state of the first user being a specific emotional state, control the wireless communication processor to transmit status information of the mobile terminal (100B, 200B, 300B, 400B) to the second external device in response to activation of the camera, wherein the status information includes implementation information of the camera, control the camera to capture the preview image in response to a predetermined condition without a capture command of a user of the mobile terminal, control the wireless communication processor to transmit the captured image to the second external device, and output information indicating the specific emotional state of the first user.