A communication apparatus includes: a modem that modulates and demodulates a signal transmitted and received through a communication line; a caller information acquisition unit that acquires caller information for identifying a caller based on the signal output from the modem; a display device that displays the caller information; an instantaneous disconnection detection unit that detects an occurrence of an instantaneous disconnection while the communication line is connected; and a reconfiguration unit that reconfigures the modem when the instantaneous disconnection detection unit detects the instantaneous disconnection.