A mobile terminal device is disclosed. The device includes a display module, a communication module, a sound input module, a sound output module, a hold detection module and a control module. The communication module is configured to receive an incoming call. The sound input module is configured to receive sound from a user. The sound output module is configured to output sound of the call. The hold detection module is configured to detect that the mobile terminal device is held. The control module is configured to perform a process of notifying the caller that the user cannot take the call when the communication module receives an incoming call, the hold detection module detects that the mobile terminal device is held and then the hold detection module detects that the mobile terminal device is not held.