1. A voice recognition apparatus comprising: a voice input element for inputting voice of an user; a voice pattern memory for storing a plurality of voice patterns respectively corresponding to a plurality of phrases, which are preliminary set; a voice recognition element for calculating a similarity degree between the voice and each of the voice patterns and determining the highest similarity degree so that one of the voice patterns corresponding to the highest similarity degree is recognized as the voice of the user; a display for displaying a recognition result corresponding to the one of the voice patterns; an execution determination element for executing a process according to the one of the voice patterns when a predetermined operation is input by the user after the display displays the recognition result; a load estimation element for estimating a load of the user; and a display controller for controlling the display based on a positive correlation between the estimated load and display repetition of the recognition result on the display.
2. The apparatus according to claim 1 , wherein the display controller includes: a determination value setting element for setting a display determination value having a negative correlation to the estimated load; and a display prohibition element for prohibiting the display from displaying the recognition result when the highest similarity degree is smaller than the display determination value.