A telephone equipment having a main apparatus and a plurality of cordless
handsets, which can perform an extension communication with being relayed
by the main apparatus. Such a telephone equipment includes a line holding
system that holds a connection between the main apparatus and the outside
apparatus, an extension communication detecting system that detects start
of the extension communication when the communication with respect to the
outside apparatus is being held, a timer that measures a time period
elapsed from the start of the extension communication, and a notification
system that causes at least one of the cordless handsets performing the
extension communication to perform a notifying operation when the time
period measured by the timer exceeds a predetermined time period.