A mobile terminal device includes a wireless communication interface and a wired communication interface. The device further includes a wired communication determination unit configured to determine whether or not communication with a network by the wired communication interface, an external power source supply unit configured so as to be supplied power from the outside for charge or replacement of a built-in battery, a power supply state detection unit configured to detect that a state, in which power is supplied from the outside to the external power source supply unit, is attained, and a control unit configured to set a state in which the wireless communication interface is available regardless a determination result of the wired communication determination unit after the power supply state detection unit detects the state in which the power is supplied from the outside.