Portable terminal, key operation control method thereof, and program

A non-transitory computer readable information storage medium that stores a key operation control program for a portable terminal, the portable terminal comprising a display unit, a touch panel which is arranged on the display unit and a part other than the display unit extended from the display unit and detects a position touched by a user on the display unit and outside the display unit, and a key part which is arranged outside the display unit on the touch panel and detects key pressing via the touch panel,

• the program causing a computer to function as a control unit which performs first control and second control,
• the first control being control which, when detecting that the user touches a detection area set near the key part of the display unit via the touch panel, even if detecting that the user touches the key part, does not process the touch on the key part as key pressing,
• the second control being control which, when detecting that the user touches the key part, does not process the touch on the key part as key pressing for a certain period of time, and when detecting that the user touches the detection area or a boundary area within the certain period of time, does not perform a key press processing on the key part regardless of an elapse of the certain period of time, the boundary area being arranged between the display unit and the key art part on the touch panel.