A communication terminal apparatus includes a memory, and a processor coupled to the memory, configured to when an incoming-call notice is received, determine whether or not, among calls that have been initiated and that have failed to be answered, a call for which a number of a call reception destination matches a number of a call initiation source included in the incoming-call notice and for which a time related to initiation of the call and a time related to the incoming-call notice have a given relationship therebetween has been initiated, and when the call has been initiated, cause the communication terminal apparatus or a communication terminal apparatus that is the call reception destination to output information indicating suppression of initiation of a call.