There is obtained a telephone set capable of preventing a noise generated
by an operation of application software during voice communication from
being sent to a speech counterpart. In a mobile telephone set, if a user
operates activated application software other than voice communication
related application software when the mobile telephone set is in voice
communication with another telephone set via a communication network, the
mobile telephone set requests hold of the voice communication from the
communication network. This causes the voice communication to be held,
thereby preventing a noise generated by the above operation from being
sent to the another telephone set.