PURPOSE: To easily transmit log-in procedure data by irreducible key operation by storing plural log-in procedure data in a text memory together with a stop code.

CONSTITUTION: The text memory is stored with plural groups of log-in procedure data consisting of log-in transmission unit data and stop code at its tail previously in specific order. Then they are displayed on a display means for a transmission command from a host computer. When a command means is operated every time this transmission command is displayed, the command means commands the transmission of log-in unit data of each log-in procedure data in the text memory. Every time this command operation is operated, each log-in transmission unit data is sent to the host computer. Thus, the log-in procedure data are easily transmitted by the irreducible key operation.