Electronic device for authenticating using biometric information and method of operating electronic device

An electronic device comprising:

• a display;
• at least one processor;
• and
• at least one memory storing one or more computer programs including instructions configured to be executed by the at least one processor to cause the at least one processor to at least:
• detect an event for executing an application which provides an authentication service,
• based on the detecting of the event, change at least one biometric information recognition related variable comprising at least one variable indicating a state of a captured image obtained through a camera of the electronic device,
• match the captured image to an authentication guide image,
• control the display to display an application execution screen including at least one authentication guide image comprising a changed authentication guide image changed from the authentication guide image based on the changed at least one biometric information recognition related variable, and
• perform user authentication based on the at least one biometric information recognition related variable,
• wherein the at least one biometric information recognition related variable further comprises a variable indicating a state of a reference area set for recognizing biometric information from the captured image, and
• wherein the at least one authentication guide image further includes another changed guide image changed from another guide image based on the variable indicating the state of the reference area.