A wireless communication system comprising: a base unit that is to be connected to a wired network; and a mobile information terminal comprising: a short range communication unit configured to communicate with the base unit, using a short range communication protocol; and a public radio communication section that performs radio communication via a public radio network, wherein the mobile information terminal further comprises a functional button that activates a connection process of a short range communication link or a stop process of the short range communication link, wherein: the mobile information terminal is configured to activate the stop process of the short range communication link when the functional button is operated in a state where the short range communication link is connected, and the mobile information terminal is configured to activate the connection process of the short range communication link when the functional button is operated in a state where the connection process of the short range communication link is not activated; and the mobile information terminal is configured to activate the connection process of the short range communication link when a predetermined operation other than the operation of the functional button is performed in a state where the short range communication link is stopped by the functional button, characterized in that the mobile information terminal is configured to display, when connected to the base unit, event information transmitted from the base unit on a display section; and the base unit is configured to record event information that occurs while the short range communication link with the mobile information terminal is disconnected, and the base unit is configured to transmit the event information to the mobile information terminal when connected to the mobile information terminal. a base unit that is to be connected to a wired network; and a mobile information terminal comprising: a short range communication unit configured to communicate with the base unit, using a short range communication protocol; and a public radio communication section that performs radio communication via a public radio network, wherein a short range communication unit configured to communicate with the base unit, using a short range communication protocol; and a public radio communication section that performs radio communication via a public radio network, wherein the mobile information terminal further comprises a functional button that activates a connection process of a short range communication link or a stop process of the short range communication link, wherein: the mobile information terminal is configured to activate the stop process of the short range communication link when the functional button is operated in a state where the short range communication link is connected, and the mobile information terminal is configured to activate the connection process of the short range communication link when the functional button is operated in a state where the connection process of the short range communication link is not activated; and the mobile information terminal is configured to activate the connection process of the short range communication link when a predetermined operation other than the operation of the functional button is performed in a state where the short range communication link is stopped by the functional button, the mobile information terminal is configured to activate the stop process of the short range communication link when the functional button is operated in a state where the short range communication link is connected, and the mobile information terminal is configured to activate the connection process of the short range communication link when the functional button is operated in a state where the connection process of the short range communication link is not activated; and the mobile information terminal is configured to activate the connection process of the short range communication link when a predetermined operation other than the operation of the functional button is performed in a state where the short range communication link is stopped by the functional button, characterized in that the mobile information terminal is configured to display, when connected to the base unit, event information transmitted from the base unit on a display section; and the base unit is configured to record event information that occurs while the short range communication link with the mobile information terminal is disconnected, and the base unit is configured to transmit the event information to the mobile information terminal when connected to the mobile information terminal.