Warning indication means of a warning LED lamp 22, etc., is disposed in the vicinity of a transmitter section 1 within a filed of view 13 of the user during conversation and if the battery remaining quantity falls below a specified value or antenna sensitivity is degraded, interfering with conversation, the warning indication means is blinked for warning the user without interfering with conversation during the conversation. The user becomes aware of the blinking warning indication means and recognizes a warning issued by a portable communication terminal 24. Based on the recognition, the user can also know more detailed warning contents by seeing an LCD section during the conversation.