When settlement terminal device performs a settlement process with a settlement destination device (for example, an acquirer or a settlement processor), settlement terminal device displays a screen regarding the settlement process on display unit of touch panel and detects an input operation of important key input reception icon displayed on display unit. CPU determines whether an input operation with respect to this important key input reception icon, that is, an operation for selecting important key input reception icon and dragging and dropping important key input reception icon to YES icon has been performed. When a drag and drop operation of important key input reception icon is detected, CPU executes content of the input operation with respect to important key input reception icon, and transmits a settlement processing request to the settlement destination device. Settlement terminal device facilitates the operator being conscious of an operation with respect to a specific target.