Portable terminal device

A portable terminal device including a housing provided with a display arranged therein and a light-transmitting touch panel input unit arranged so as to cover a screen of the display, and capable of executing one operation mode selected by a user from a plurality of operation modes, the portable terminal device comprising:

• a scroll line displaying unit configured to display on the screen of the display a scroll line extending in one direction on the screen and move the scroll line in accordance with a scroll operation by a user in a direction crossing the one direction;
• a mode selection control unit configured to select one operation mode correlated to a predetermined position of the scroll line from the plurality of operation modes in accordance with the scroll operation by the user, and form a display area and an operation area with the scroll line serving as a boundary line therebetween on the screen of the display so as to display in the display area an initial screen of one selected operation mode, while to display in the operation area one or more operation keys to be used in said operation mode, the predetermined position of the scroll line, which is moved by the scroll line displaying unit, being defined to correspond with each of the plurality of operation modes;
• and
• a mode execution control unit configured to fix one selected operation mode in response to a mode fixing operation by the user made in a state where one operation mode is selected, execute a predetermined process of the operation mode in response to an operation of an operation key displayed in the operation area, and display an operation screen in the display area.