A content reproduction system, comprising: a content reproduction apparatus which reproduces at least three types of contents that is a video content including audio information and image information, an audio content including audio information, and an image content including image information; and a device connected to said content reproduction apparatus and outputs a content reproduced by said content reproduction apparatus to a user, wherein: said content reproduction apparatus is provided with an acknowledging unit which acknowledges based on a driving condition of said device, when image information is included in said content, whether an image of said image information can be displayed effectively to the user by said device, as visible condition, or not, as invisible condition, and when audio information is included in said content whether audio of said audio information can be outputted effectively to the user, as audible condition, by said device or not, and a controlling unit which limits a type of content to be reproduced by said content reproduction apparatus according to said acknowledged driving condition; said device is a head mounted display; and said controlling unit acknowledges whether an image display device of said head mounted display is in visible condition or in invisible condition for said user, and automatically migrates to a mode which reproduces said audio information of said audio content from either a mode which reproduces said image information and said audio information of said video content or a mode which reproduces said image information of said image content when said image display device migrates from said visible condition to said invisible condition during reproduction of one of said video content and said image content. a content reproduction apparatus which reproduces at least three types of contents that is a video content including audio information and image information, an audio content including audio information, and an image content including image information; and a device connected to said content reproduction apparatus and outputs a content reproduced by said content reproduction apparatus to a user, wherein: said content reproduction apparatus is provided with an acknowledging unit which acknowledges based on a driving condition of said device, when image information is included in said content, whether an image of said image information can be displayed effectively to the user by said device, as visible condition, or not, as invisible condition, and when audio information is included in said content whether audio of said audio information can be outputted effectively to the user, as audible condition, by said device or not, and a controlling unit which limits a type of content to be reproduced by said content reproduction apparatus according to said acknowledged driving condition; said device is a head mounted display; and said controlling unit acknowledges whether an image display device of said head mounted display is in visible condition or in invisible condition for said user, and automatically migrates to a mode which reproduces said audio information of said audio content from either a mode which reproduces said image information and said audio information of said video content or a mode which reproduces said image information of said image content when said image display device migrates from said visible condition to said invisible condition during reproduction of one of said video content and said image content. said content reproduction apparatus is provided with an acknowledging unit which acknowledges based on a driving condition of said device, when image information is included in said content, whether an image of said image information can be displayed effectively to the user by said device, as visible condition, or not, as invisible condition, and when audio information is included in said content whether audio of said audio information can be outputted effectively to the user, as audible condition, by said device or not, and a controlling unit which limits a type of content to be reproduced by said content reproduction apparatus according to said acknowledged driving condition; said device is a head mounted display; and an acknowledging unit which acknowledges based on a driving condition of said device, when image information is included in said content, whether an image of said image information can be displayed effectively to the user by said device, as visible condition, or not, as invisible condition, and when audio information is included in said content whether audio of said audio information can be outputted effectively to the user, as audible condition, by said device or not, and a controlling unit which limits a type of content to be reproduced by said content reproduction apparatus according to said acknowledged driving condition; said device is a head mounted display; and said controlling unit acknowledges whether an image display device of said head mounted display is in visible condition or in invisible condition for said user, and automatically migrates to a mode which reproduces said audio information of said audio content from either a mode which reproduces said image information and said audio information of said video content or a mode which reproduces said image information of said image content when said image display device migrates from said visible condition to said invisible condition during reproduction of one of said video content and said image content.