An information processing apparatus comprising: a touch-enabled display means; a lock means that puts the information processing apparatus in standby state and disables all touch gestures except for specified touch gestures including unlock gestures, by locking the information processing apparatus after user logout; a display control means that performs the following operations: initially displaying a lock screen on the display means, the lock screen indicating that the information processing apparatus is presently locked, the lock screen having a first icon for unlock and one or more second icons ∼ each representing a function of the information processing apparatus; and refreshing the lock screen initially displayed on the display means such that the first icon is present at a different position on the lock screen, when a user moves the first icon on the display means; an unlock means that unlocks the information processing apparatus based on touching and moving the first icon on the lock screen by the user that intends to log in; a recognition means that recognizes a function as being selected by the user, the function being represented by the one second icon or one of the second icons ∼ being present at the position where the user releases the first icon; characterised by: a user information obtaining means that obtains user information from wireless communication signals for identifying the user without requiring user input; and an authentication means that conducts user authentication on the user with the user information obtained by the user information obtaining means, while the user is moving the first icon, wherein the display control means changes the lock screen on the display means to a dedicated screen of the user if user authentication is finished by the authentication means while the user is moving the first icon, the dedicated screen of the user is a screen to be displayed when the user selects a function represented by the one second icon or one of the second icons; and the dedicated screen of the user is refreshed in sync with the position of the first icon moved by the user, wherein the authentication means conducts user authentication on the user when the user starts moving the first icon. a touch-enabled display means; a lock means that puts the information processing apparatus in standby state and disables all touch gestures except for specified touch gestures including unlock gestures, by locking the information processing apparatus after user logout; a display control means that performs the following operations: initially displaying a lock screen on the display means, the lock screen indicating that the information processing apparatus is presently locked, the lock screen having a first icon for unlock and one or more second icons ∼ each representing a function of the information processing apparatus; and refreshing the lock screen initially displayed on the display means such that the first icon is present at a different position on the lock screen, when a user moves the first icon on the display means; an unlock means that unlocks the information processing apparatus based on touching and moving the first icon on the lock screen by the user that intends to log in; a recognition means that recognizes a function as being selected by the user, the function being represented by the one second icon or one of the second icons ∼ being present at the position where the user releases the first icon; characterised by: a user information obtaining means that obtains user information from wireless communication signals for identifying the user without requiring user input; and an authentication means that conducts user authentication on the user with the user information obtained by the user information obtaining means, while the user is moving the first icon, wherein the display control means changes the lock screen on the display means to a dedicated screen of the user if user authentication is finished by the authentication means while the user is moving the first icon, the dedicated screen of the user is a screen to be displayed when the user selects a function represented by the one second icon or one of the second icons; and the dedicated screen of the user is refreshed in sync with the position of the first icon moved by the user, wherein the authentication means conducts user authentication on the user when the user starts moving the first icon. a user information obtaining means that obtains user information from wireless communication signals for identifying the user without requiring user input; and an authentication means that conducts user authentication on the user with the user information obtained by the user information obtaining means, while the user is moving the first icon, wherein the display control means changes the lock screen on the display means to a dedicated screen of the user if user authentication is finished by the authentication means while the user is moving the first icon, the dedicated screen of the user is a screen to be displayed when the user selects a function represented by the one second icon or one of the second icons; and the dedicated screen of the user is refreshed in sync with the position of the first icon moved by the user, wherein the authentication means conducts user authentication on the user when the user starts moving the first icon.