A mobile terminal comprising: a main body comprising a microphone; a screen display unit comprising speaker-and-receiver units (226,227) at both ends thereof, the screen display unit being disposed in the main body in such a manner that the screen display unit can slide and rotate with respect to the main body; and control means to operate each of the speaker-and-receiver units as a speaker for outputting sound of a broadcast signal, playing back a recorded signal, or for producing a ringtone or a receiver for outputting sound from an other end of a telephone call according to a style formed by the screen display unit and the main body, style detection means to detect a style formed by the screen display unit and the main body; first and second amplification means (216, 217) to amplify a broadcast signal or a recorded sound signal; third amplification means to amplify a telephone call signal; and switch means (224, 225) to switch a connection between the first, second, and third amplification means (216, 217, 218) and either of the speaker-and-receiver units (226, 227) according to the style based on an instruction from the control means, characterized in that when a ringtone is ringing, in a case of either of a style in which both the speaker-and-receiver units (226, 227) and the microphone are arranged on the same line with a maximum distance therebetween and a style in which both the speaker-and-receiver units (226, 227) and the microphone are arranged on the same line with a minimum distance therebetween, the control means operates the speaker-and-receiver unit closer to the microphone as a speaker for producing the ringtone, switches the switch means (224, 225) so that the other speaker-and-receiver unit is turned off, puts the first and second amplifier means (216, 217) into a non-operated state, and adjusts an output of the third amplifier means to or below a predetermined value. a main body comprising a microphone; a screen display unit comprising speaker-and-receiver units (226,227) at both ends thereof, the screen display unit being disposed in the main body in such a manner that the screen display unit can slide and rotate with respect to the main body; and control means to operate each of the speaker-and-receiver units as a speaker for outputting sound of a broadcast signal, playing back a recorded signal, or for producing a ringtone or a receiver for outputting sound from an other end of a telephone call according to a style formed by the screen display unit and the main body, style detection means to detect a style formed by the screen display unit and the main body; first and second amplification means (216, 217) to amplify a broadcast signal or a recorded sound signal; third amplification means to amplify a telephone call signal; and switch means (224, 225) to switch a connection between the first, second, and third amplification means (216, 217, 218) and either of the speaker-and-receiver units (226, 227) according to the style based on an instruction from the control means, characterized in that when a ringtone is ringing, in a case of either of a style in which both the speaker-and-receiver units (226, 227) and the microphone are arranged on the same line with a maximum distance therebetween and a style in which both the speaker-and-receiver units (226, 227) and the microphone are arranged on the same line with a minimum distance therebetween, the control means operates the speaker-and-receiver unit closer to the microphone as a speaker for producing the ringtone, switches the switch means (224, 225) so that the other speaker-and-receiver unit is turned off, puts the first and second amplifier means (216, 217) into a non-operated state, and adjusts an output of the third amplifier means to or below a predetermined value.