An information processing apparatus comprising: a display unit (120, 142), provided on a front surface of the information processing apparatus, for displaying information; a first detection unit (130, 143), provided on a back surface of the information processing apparatus, for detecting an operation input to the back surface of the information processing apparatus; a second detection unit, provided on the front surface, for detecting an operation input to the display unit (120, 142); an operation input information determination unit for identifying a function to be executed corresponding to the operation inputs to the back surface and the display unit (120, 142) based on detection results of the first detection unit (130, 143) and the second detection unit; and a function execution unit for executing the function identified by the operation input information determination unit in response to receiving an instruction for execution of the function from the operation input information determination unit, characterized in that the operation input information determination unit causes the function to be executed by the function execution unit if the information processing apparatus is in an enabled state in which a password lock is released; and in that the information processing apparatus further comprises: an authentication processing unit for performing an authentication process based on an operation input detected by the first detection unit (130, 143) in a disabled state of the information processing apparatus in which the password lock is active; and an authentication information storage unit for storing authentication information, wherein the authentication processing unit is configured to perform the authentication process by identifying input information input in the disabled state with an operating tool from the back surface based on an input timing pattern or a movement of the operating tool detected by the first detection unit (130, 143), comparing the input information with the authentication information, and setting the information processing apparatus to the enabled state in which the password lock is released if it is determined that the input information and the authentication information match. a display unit (120, 142), provided on a front surface of the information processing apparatus, for displaying information; a first detection unit (130, 143), provided on a back surface of the information processing apparatus, for detecting an operation input to the back surface of the information processing apparatus; a second detection unit, provided on the front surface, for detecting an operation input to the display unit (120, 142); an operation input information determination unit for identifying a function to be executed corresponding to the operation inputs to the back surface and the display unit (120, 142) based on detection results of the first detection unit (130, 143) and the second detection unit; and a function execution unit for executing the function identified by the operation input information determination unit in response to receiving an instruction for execution of the function from the operation input information determination unit, characterized in that the operation input information determination unit causes the function to be executed by the function execution unit if the information processing apparatus is in an enabled state in which a password lock is released; and in that the information processing apparatus further comprises: an authentication processing unit for performing an authentication process based on an operation input detected by the first detection unit (130, 143) in a disabled state of the information processing apparatus in which the password lock is active; and an authentication information storage unit for storing authentication information, an authentication processing unit for performing an authentication process based on an operation input detected by the first detection unit (130, 143) in a disabled state of the information processing apparatus in which the password lock is active; and an authentication information storage unit for storing authentication information, wherein the authentication processing unit is configured to perform the authentication process by identifying input information input in the disabled state with an operating tool from the back surface based on an input timing pattern or a movement of the operating tool detected by the first detection unit (130, 143), comparing the input information with the authentication information, and setting the information processing apparatus to the enabled state in which the password lock is released if it is determined that the input information and the authentication information match.